RC at junkyardjake.com has some excellent rankings for Week 15, http://www.junkyardjake.com/Rankings/Season/ I would compare what he has to my rankings if you are having a hard time deciding who to start.
Do you use an RSS reader like Google Reader to keep up with websites? I highly recommend you keep up with sites this way so you stay up to date on what's going on. Another thing to do is check out Sara's site http://www.fflibrarian.com/ daily for other great links.
http://lesterslegends.com/ has excellent rankings and articles to review while deciding on your lineups.
Do you ever check out target reports? It can help you see what WR's are being most utilized from week to week. Check out Fantasy Knuckleheads for their target report: http://fantasyknuckleheads.com/week-15-target-report-laurent-robinson-still-valued/
How about some week 15 picks from the Hazean: http://thehazean.com/2011/12/15/the-backdoor-cover-week-15-nfl-picks-2/
I will be continuing Hatty Waiver Wire Guru into the playoffs and providing playoff rankings for those of you who compete in playoff challenges. I have back to back years on nfl.com playoff challenge where I was top 1000 overall.