Having switched to OS X about a year ago after years of Linux usage, I can say that personally I really like the case insensitivity OS X has by default. It doesn't whine every time I accidentally (don't) press caps lock. Case sensitive file systems must be the dumbest invention ever. Who is seriously going to distinguish his/her files by capital and non-capital letters? "Test.txt" and "test.txt" should be the same!