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Just for another data point. I purchased the $25 Remember the milk subscription just so I could get the iPhone access. If you made this work with the iPhone I think you will create market share.

Maybe you could make it free for people unless they want the advanced features. The features could be sms/email notifications, more projects than x at a time, or whatever you might deem worth charging for. You will need to tweak the business model but so far the site looks clean and usable. Good job.

An iPhone interface and/or a generic smart phone interface (Android, WinMo, etc). Forget the lower end phones that don't support CSS, they aren't going to be in your demographic anyway.

A lot of times you can get away with a decent smart phone interface and just put a few meta tags in the head tag for the iPhone so that it looks slick for the iPhone too.

iPhone is fine since I have an Android.