FileHound - File Transfer On The Go + Remote Desktop (iOS) app for $1.99
No more sync'ing files! No more worrying about forgetting to upload your files to Dropbox, Box.net or other online storage service. FileHound lets you directly access and download all your files on your PC everywhere you go with your iPhone! You can either download and view the files with iPhone local viewer/apps or stream the files in their native PC applications (Word, Excel, PowerPoint, Windows Media Player, iTunes, etc.). No more file compatibility issues.
Included in FileHound is also the award-winning Splashtop Remote Desktop feature which gives you full remote desktop capability. Splashtop Remote Desktop is the #1 remote desktop app on iPhone!++