The three free invites go to stobs, jminera, ballistic. Harpgliss and ortaliz, you will get the next two invities as soon as I have some available again (everyone, please PM me with your email address).
If you have more suggestions to add, please feel free to post them here. I just don't have any more invities available at the moment
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stobs, great idea on the sitescooper/.sites container. I will see what software solution works best to realize this kind of a project.
jminera, thank you for pointing out the vage slogan. Perhaps a one liner should be added to the front page explaining more appropriately what this site is all about. I am not so great with slogans or concise english phrases, but I am sure we'll find a good explanation.
ballistic, this is a great idea. I must add review section for various upcoming projects ASAP, and adding book reviews to it is just one way to enhance our site. The "Currently Reading" list sounds like fun; I must think of a way how I can best implement it.
Harpgliss, is there anything in particular on the frontpage that you would like to see in mobile form? I am not even sure how many people here browse our mobile site. Perhaps a poll is appropriate. As soon as I have time, I will optimize the code, and will also consider adding a search feature.
ortaliz, I was thinking about WAP and to translate the board from HTML to WML. The problem is that WAP is extremely limited and small, and I don't think it is useful to spend too much time on it... unless there is more demand for it, of course

Your second suggestion sounds interesting. I am going to discuss with other team members how we could offer @mobileread.com e-mails in future.