I use a Google spreadsheet to keep track of my characters found datacrons. Link: https://docs.google.com/spreadsheet/ccc?key=0AnEMYW0t0M7pdDVOT1VfbHA1dmU5MWNZNFNjMFdzSGc#gid=0 The author of the spreadsheet has a post about it here: http://www.swtor.com/community/showthread.php?t=606520 I know this has helped me a lot, so I hope it can help you too