there's a lot of closed-source libraries that aren't available in x64 form... but then again, there's a lot of opensource code that doesn't compile cleanly for x64 as well.
For x64? Heck, there's a lot of open source code that doesn't compile all that swell under x32 either.
But really, if your applications don't need 64-bit, why port them? Most applications gain zero advantages whatsoever from a recompile, they only become (slightly) bigger and consume (slightly) more memory.
Thank you so much for pointing that out. People sometimes fail to see that newer isn't always better.