I keep hearing cool remixes everywhere and would like to give it a go myself. But where can I get my digital hands on isolated vocal tracks to use? You know, where all you hear is the singer and perhaps backupsingers as well.
Anyone know about any sites for this or are there any DIY trick to make one myself from a regular song?
You should find a buttload here!!
If you are not already clear, click on acapellas for just vocals!
Make sure to refine your search to those with attribution licenses if you want to go commercial with them! 
In case someone else is interested in finding isolated vocals from songs I found: http://www.acapellas4u.co.uk/
Some of the vocals are from songs that are pretty famous or well known at least.