A little note before I head off to work, I see that a new version of ASpectrum has been released. v0.1.7 has a few changes in it, now supporting several additional models of Spectrum: 16k, Inves, Spanish 128k, and +2. It also features working with snapshots (I'm not sure if it did this before). Ok, so the feature-set isn't the greatest so far, but importantly the project is Open Source, and written in C. You'll need to translate the site from Spanish, tho'.