Let the hive mind of Engadget get that for you.
"I just switched to Sprint from Verizon about three months ago for the Pre. Then I went for the Hero about a week ago. Now, I miss my hardware keyboard and am thinking about switching to the Moment. I am still able to switch back to Verizon if I want and get the Droid when it arrives. Should I just trade up to the Moment when it comes out, see if I like it, and if not switch to the Droid? Or something else entirely? Help!"
#4: Axcess Web runs $5.99/month (for the same services you'll get for $1.49/day)
http://www.alltel.com/axcess/mobile_web.html
This would be a splendid idea... if I could pay per day for tethering to a laptop or PDA. I'd pay $5/day for that - heck, I just paid $12/day to a hotel...