Thank you very much for the concepts! I did not expect to get them so quickly.
Some thoughts:
So far, I liked #8 and #5 but I am still open to different designs.
For #4, I liked the idea of incorporating "touch" into the image but I would prefer simpler and cleaner image, like icon used in iPhone apps.
Here are some logs/sites that I like. Hope they can help you to get some ideas on my preference.
http://www.intomobile.com/http://www.engadget.com/http://twitter.com/http://www.tuaw.com/