I use Gmail for my main email account, and then I have a yahoo account that used to be my main mail account, but has slowly turned into a junk mail account. I also have a hotmail account, but thats primarily because I just wanted an account to use msn. Its been a long time since anyone I know has actually used hotmail as a real email account.
For IM, I use MSN but that is primarily because everyone uses it. I used to use ICQ primarily (much better than msn, especially for file transfers). I have tried yahoo's messenger and the aol one, but none of them really sparked an interest.
For maps and stuff, I use Google earth and maps exclusively, with the occasional use of mapquest instead.