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Distribution: Slackware (mainly) and then a lot of others...
The main reason I think is backward compatibility. You can run a 32 bit OS on a 64 bit computer but not vice versa.
There also seems to some issued with some 32 bit applications not porting properly to 64 bit.
And then we have the stupid things like flash and (jdk too I think) that do not run on 64 bit pcs.
Hope this helps.