I'm am in full smit (that's right, fully smote) with two web-based apps right now...
Both allow you to send emails via a phone call, both do it slightly differently and both have me no longer banging my head against the steering wheel in traffic but rather getting a few things done and a few people contacted while I suck diesel fumes.
You can even send to-do items to your Backpack pages. Awesome. So smitten.