Thanks
For link exchanges, I haven't seen it make a difference, but since a human being evaluates the exchange it might possibly make a difference.
Don't think it would make a difference to a DMOZ or YAHOO editor, but who knows?
For type in domains in the browser, .BIZ is no where near as good as .COM. .NET and .BIZ are probably equivilent in that area.
I dounbt The spiders will care either way(.COM, .BIZ, .NET), but I can't read their minds better than anyone else here.