Freelancers: check out Wor.kaholi.com iPhone Web App

I've been using this time tracking iPhone web app like crazy and really love it.

A simple, intuitive, tool to make tracking client, project and workflow time convenient and simple. Perfect for all types of freelance and paid by time applications. Even works great to quickly monitor your current workday totals (then view a report to check timecard accuracy)!

Manage multiple projects for many clients all through one simple interface.

Time can be displayed as simple reports showing total project commitment or in an expanded chronological format showing each work period’s contribution.
Details

link only works on iPhone:
URL:
WorKaholiCom Time Tracker

To start using it, go to Web Apps in your iPhone bookmarks. You can add the icon to your home screen too.

Thanks to whoever made this. There's just one little thing I would love to be able to see "just today" -- instead of the last 30 days -- for each client.