According to http://groups.msn.com/whenpagansunited/listofgoddesses.msnw, Arianrhod will help with remembering past lives. This is very fascinating.
I found it interesting, also, that she was instrumental in the creation of Blodeuwedd and tricked into a relationship with Llew (naming him and giving him arms). I don't particularly care for her, but plan to ask her assistance with moon rituals. I do a lot of knitting and crocheting, though, and believe that she could help with those endeavors (as the Goddess of weaving).
The best tribute I found to Arianrhod was at http://www.gather.com/viewArticle.jsp?articleId=281474976744373. You should read it! It's amazing!
Goddess Arianrhod, bless this yarn I am to use.
Help me weave the ends just right.
Your blessing I do not wish to loose,
As I keep the goal in sight.
This is my wish, so mote it be.