http://thesweethome.com/reviews/best-sheets-new/ is a very thorough guide. They recommend LL Bean and say they don't need ironing, but also say that if smoothness is your top priority, you should get Royal Velvet 400-thread-count Wrinkle-Guard sheets.
Please recommend your wrinkle free bedding/sheets. I bought ones that said wrinkle free from BBB but OMG...worst ever!!!! I don't know if its my new Samsung dryer, or my OCD to sleep on crisp, pressed sheets but its driving me crazy and I wash every week. So time it takes to iron is so not worth it. I need recs on sheets that actually are "WRINKLE FREE"