Twitter via e-mail

I've been looking for a client that can access Twitter via e-mail -- in a convenient way. I didn't want too many emails, so it would have to be summarised. And I wanted the ability to reply.

Couldn't find one, so I wrote one at http://www.mixamail.com/

My reason was that I have e-mail but no Internet access on my BlackBerry.

Just wondering: is this a problem anyone else faces? What workarounds have you used?