Windows 7 64bit Compatibility For ALL Tools ??

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I realize there is a thread in 2010 but I would have sworn I had heard that certain 2011 utilities or tools or debuggers or something are not compatiable with 64 Windows 7. I have 64 bit Win 7 on a laptop (NOT the classmate) and am wondering if I should consider installing 32bit Win 7 before I install development environments.

- anyone confirm Windriver and all tools, works in 64b Win 7
- " Labview including camera etc ?
- " Java Netbeans ?

Alteratively anyone know for certain something does not work or know where any links is to documented problems or warnings ?

- Also, I would be interested to hear if there is any other benefit of using 64bit Win 7 over 32bit Win 7 other than support for memory above 3GB.

- anyone know if any development tool is using A LOT of memory in Win 7 ?
Is a 2 gb laptop well capable of hosting a typical development environment ?