I can make Google Earth crash reproducably on my system. In fact, it's almost impossible to use on my box due to these crashes...

Google Earth version 3.1.0617.0
Build Date: Feb 9 2006
Build Time: 17:20:38
OS: OS X 10.4.5
Video: NVIDIA NV34MAP OpenGL Engine (1.5 NVIDIA-1.4.18)
Max Texture Size = 4096x4096

hardware is Apple PowerBook G4 12"

This is easily reproducable on my system... steps:
1) create a placemark and save it to MyPlaces
2) Ctrl-<Mouse-Click> on it to bring up the context menu
3) Perform any operation in the menu or click away to dismiss it
4) Ctrl-<Mouse-Click> on any item
You are unable to select any items in the menu and a few seconds later GE crashes.

Here's the first few lines of the crash:

Date/Time: 2006-03-08 21:04:05.797 -0800
OS Version: 10.4.5 (Build 8H14)
Report Version: 4

Command: Google Earth
Path: /Applications/Google Earth.app/Contents/MacOS/Google Earth
Parent: WindowServer [61]

Version: ??? (3.1.0617.0)

PID: 19755
Thread: 0

Exception: EXC_BAD_ACCESS (0x0001)
Codes: KERN_INVALID_ADDRESS (0x0001) at 0xbf7ffff0

Thread 0 Crashed:
0 com.apple.CoreGraphics 0x903a0474 CGRectEqualToRect + 16
1 com.apple.HIToolbox 0x931a4eec SameAsLastState(void*, CGRect const&, long const*) + 116
2 com.apple.HIToolbox 0x931a4f8c ResolveEverything + 52
3 com.apple.HIToolbox 0x9324adec LayoutEngine::HitLayout(TTheme*, void*, CGRect const&, long const*, unsigned long, CGPoint, unsigned long const*, unsigned long&) + 120
4 com.apple.HIToolbox 0x9330efc4 DataEngine::GetWindowRegionHitMask(CGRect const&, HIThemeWindowDrawInfo const*, unsigned char, CGPoint const&, unsigned long&) + 212
5 com.apple.HIToolbox 0x93309af8 HIThemeGetWindowRegionHit + 188
6 com.apple.HIToolbox 0x93307a08 GetThemeWindowRegionHit + 192
7 com.apple.HIToolbox 0x93446308 ThemeWindowDef::HitSelf(Point) + 172
8 com.apple.HIToolbox 0x931a1d34 AppleWindowDef::HandleEvent(OpaqueEventHandlerCallRef*, OpaqueEventRef*) + 716
9 com.apple.HIToolbox 0x931a1a4c ThemeWindowDef::HandleEvent(OpaqueEventHandlerCallRef*, OpaqueEventRef*) + 660
10 com.apple.HIToolbox 0x9318dff4 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 692
11 com.apple.HIToolbox 0x9318d74c SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 372
12 com.apple.HIToolbox 0x9318d5c8 SendEventToEventTargetWithOptions + 40
13 com.apple.HIToolbox 0x9321f6a8 HitTestWindowDefinition(WindowData*, Point) + 260
14 com.apple.HIToolbox 0x9322027c FindPlatformWindow + 612
15 com.apple.HIToolbox 0x9320b1b0 FindWindowCommon(Point, OpaqueWindowPtr**, short*) + 116
16 com.apple.HIToolbox 0x9320b08c FindWindowOfClass + 88
17 libqt.3.dylib 0xb2002a14 qt_mac_find_window(int, int, QWidget**) + 56 (icplusplus.c:28)
18 libqt.3.dylib 0xb2005a74 QApplication::widgetAt(int, int, bool) + 36 (icplusplus.c:28)
19 libqt.3.dylib 0xb2110b04 QAccessible::globalEventProcessor(OpaqueEventHandlerCallRef*, OpaqueEventRef*, void*) + 492 (icplusplus.c:28)
20 com.apple.HIToolbox 0x9318dff4 DispatchEventToHandlers(EventTargetRec*, OpaqueEventRef*, HandlerCallRec*) + 692
21 com.apple.HIToolbox 0x9318d74c SendEventToEventTargetInternal(OpaqueEventRef*, OpaqueEventTargetRef*, HandlerCallRec*) + 372
22 com.apple.HIToolbox 0x9318d5c8 SendEventToEventTargetWithOptions + 40
23 com.apple.HIToolbox 0x932ff988 Accessible::SendEvent(OpaqueEventRef*, bool) const + 108
24 com.apple.HIToolbox 0x932ff560 Accessible::HitTest(CGPoint const&, __AXUIElement const**) + 124
25 com.apple.HIToolbox 0x932ff5fc Accessible::HitTest(CGPoint const&, __AXUIElement const**) + 280
26 com.apple.HIToolbox 0x932ff5fc Accessible::HitTest(CGPoint const&, __AXUIElement const**) + 280

[ same line over and over thru 508]

[other thread info.. let me know if you want this..]

Thread 0 crashed with PPC Thread State 64:
srr0: 0x00000000903a0474 srr1: 0x000000000000f030 vrsave: 0x0000000000000000
cr: 0x42022422 xer: 0x0000000020000004 lr: 0x00000000903a0474 ctr: 0x00000000903a0464
r0: 0x00000000931a4eec r1: 0x00000000bf800050 r2: 0x00000000bf800090 r3: 0x0000000042d60000
r4: 0x0000000043880000 r5: 0x0000000043880000 r6: 0x00000000437c0000 r7: 0x0000000042d60000
r8: 0x0000000043880000 r9: 0x0000000043880000 r10: 0x00000000437c0000 r11: 0x00000000a3188ea0
r12: 0x00000000903a0464 r13: 0x0000000000000002 r14: 0x0000000000000000 r15: 0x00000000a318dd58
r16: 0x00000000185e7b60 r17: 0x00000000bf8002b0 r18: 0x0000000000000078 r19: 0x00000000ffffff87
r20: 0x00000000bf8001e8 r21: 0x00000000bf800290 r22: 0x00000000bf8003f0 r23: 0x00000000098906e0
r24: 0x0000000000000000 r25: 0x00000000ffffb976 r26: 0x00000000bf8002b0 r27: 0x00000000098906e0
r28: 0x00000000098906ea r29: 0x00000000bf800290 r30: 0x00000000a31a5e84 r31: 0x00000000931a4e80

[Binary Images Description.. let me know if you want this...]

Model: PowerBook6,8, BootROM 4.9.0f0, 1 processors, PowerPC G4 (1.2), 1.5 GHz, 1.25 GB
Graphics: GeForce FX Go5200, GeForce FX Go5200, AGP, 64 MB
Memory Module: DIMM0/BUILT-IN, 256 MB, built-in, built-in
Memory Module: DIMM1/J31, 1 GB, DDR SDRAM, PC2700U-25330
AirPort: AirPort Extreme, 404.2 (3.90.34.0.p16)
Modem: Jump, , V.92, Version 1.0,
Bluetooth: Version 1.7.0f18, 2 service, 0 devices, 1 incoming serial ports
Network Service: Built-in Ethernet, Ethernet, en0
Parallel ATA Device: MATSHITADVD-R UJ-835E,
Parallel ATA Device: FUJITSU MHT2080AH, 74.53 GB
USB Device: Bluetooth HCI, , Up to 12 Mb/sec, 500 mA
USB Device: Apple Internal Trackpad, Apple Computer, Up to 12 Mb/sec, 500 mA

/\/\/\/\/\/\/\/\/\

Thanks!