Been using the mycloud version as I was waiting for the price to drop on the HD version. Very useful app in my opinion.
Both the Standard and HD versions are on sale for a limited time
Android
Splashtop Desktop Remote FREE ON GETJAR
Splashtop Desktop Remote HD $4.99
iOS
Splashtop Desktop Remote iPhone & iPod $0.99
Splashtop Desktop Remote iPad $1.99
Edit: As pointed out by huyie, the standard version for android is free on Getjar
Never heard of this one before, been using Teamviewer which is free for personal use.