Ok one of the most popular items here is the Nes Emulator well i have been playing around with the spectrum emulator and now have it working on the MDA Vario along with the keyboard .
I have been playing the hobbit lots on it and absolutley love it, works lovely
download from here
install the cab file
then open fusesp, click on menu, then options and set the following landscape left, and tick device has full keyboard
then download some tap files from a spectrum site
The best i have found is here