The excellent LotusLive Meetings app has been available for the iPhone/iPod Touch for a year or so now, but has just been released for the iPad as well:
I’ve already used it for 4 or 5 meetings and it is now my preferred access point – continue to get work done on the laptop whilst conference calls are running on the iPad alongside.  Love it!
(A couple of minor feedback points for those behind the app. Â It would be better to have landscape-mode screenshots in the App Store, much more impressive. Â Also, one universal app that does iPhone and iPad would work better for many folks as there is no need to download and manage two different apps.)