iDOS is a full DOS emulator that is based on an open-source DOS emulator, DOSbox. It is a universal app that has PC keyboard support, mouse support, multiple screen modes etc.
Over at TouchArcade, a member of their forums has managed to install and run Windows 3.0 on his iPad and is now playing Solitaire on Windows 3.0.
Windows 7 on iPad? Yep, you read that right! Previously, we only had VNC viewers and fun Windows look alike app on the iPhone and iPod Touch to get a feel of Windows on them.
But it looks like developers really want it to push further and want Windows 7 to run on the recently revealed Apple tablet, iPad.