I've been looking for a reliable, easy-to-use application to access my PC and network from my iPad, and after trying several apps, I can recommend iTap RDP. I use this app almost every day and it’s extremely reliable and useful. With a few seconds of quick setup, you can easily access a Terminal Server in your network, or directly access your desktop. It’s easy to pan and zoom, easy to use a keyboard, or even issue a CTRL+ALT+DEL.
I use iTap RDP and I highly recommend it to anyone looking for an easy way to use an iPad to access the corporate Windows network or Windows PC. You can download a trial version on the app store, or learn more on the website: http://itap-mobile.com/itap-rdp