For our next sprint, our Argentinian developer suggested we use Mountain Goat's www.PlanningPoker.com to do our story estimation. To my surprise, using it was very easy. I had an account in 30 seconds (thanks Ken for not making me retype my password when creating an account - that always annoys me - if I mess it up I'll do the "forgot password" link). I emailed our team members the link that PlanningPoker gave me and we were off and running.
I was a little skeptical that it would be worth our while, but estimating was easier using the tool.
I'd recommend it. We didn't create a story entry for each story, just used the first one and then overlaid a list of stories entered into emacs on the webex screen, everyone discussed the story and we re-voted on the "original" one. The stories will then go into Jira with the estimated effort.
Best of all it's free.