Yeah, in addition to the dummies book, I've also loved the following 2 books:
1 - The Buddha and the borderline by Kiera Van Gelder
2 - Get me out of here: My recovery from BPD by Rachel Reiland

I wouldn't call these books self-help, but they are great books to read for borderlines.

For self-help, I'd say ... find a way to love yourself