Remindo for the iPhone. Reminders by SMS and email, like magic.
remindoapp.com
remindoapp.com
Would it be better to hold off until the 3.0 release for push notifications, thereby freeing you from creating the infrastructure for SMS and email?
Looking forward to the beta test.
Since 37signals graciously offers us free accounts that provide sms and email reminders, Remindo standard can be a pay once work forever kinda deal.
Nice looking application :)
One small suggestion - "Powered" is misspelled in your title ("Powerd [sic] by Basecamp"). I hate to be pedantic but it kinda jumped out at me - being a title, and all.