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http://www.dribbble.com/ is the best source of designers. Browse through it, searching keywords, etc, and then click on the profiles of 10-15 that interest you.

Contact them. Easy!

If not, shoot me an email and I'll hook you up with a designer (emails in profile). I've connected about 20-30 HN'ers with designers.

Not sure if you'll find specifically iOS design, but http://sortfolio.com is another service for finding designers.

My contact information is in my profile, contact me if you want to discuss your specific needs.

Try http://99designs.com/ ?

whoa! $1000 for a 2 page mockup?

I'm interested, maybe we should chat? taitbrown@gmail.com

I've been using brandstack.com for ny side projects.

Drop me a line. My email is in my profile

Where can I hire designers?