I tried Harvest briefly and it was pretty solid and easy to use. There's a stopwatch or you can track hours manually. I wasn't tracking multiple projects so I didn't purchase after the trial period but a friend of mine swears by it.

http://www.getharvest.com/

I use iBiz from Igg Software. I've been using it for quite a while and think it's pretty good.

Here's the link:
http://www.iggsoftware.com/ibiz/

--
Ragnar Freyr
www.ragnarfreyr.com

You may find something here... http://www.tucows.com/Windows/Business/Management/TimeResourceManagement

Or here...

http://www.tucows.com/Windows/Business/Management/TimeClock

Or I suspect you may want to click on the Macntosh tab if you're that way inclined.

Shopping around for a time tracking program that handles multiple projects and tracks hours

You should check Fanurio. It is a desktop app that does both. It has a nice mini view window for tracking time.