Gets my vote and I use an N95.
We're well versed at using number keyboards for SMS here in the UK so you'd be surprised how big some of the logs will get even with a 'normal' phone keyboard.
Count me in for logging on site! I've got a N95 and I also have a Bluetooth keyboard. It's very handy to write down your story while finding the cache and logging it direct on the site.
And time+date stamp sounds very usefull too.
The only thing is: Travelbugs.. When I log a found I need to 'attach' a travelbugs. I don't think it's possible to attach them to a find when it's already posted. Or is it?