I feel I have to say something about this...

Yes, the site referenced in this thread isn't 100% legal. However, the site maintainers seem very keen on making the site more and more legal, therefore asking companies to tell them if they should remove downloads from particular games, and they have shown that they make good on that promise (Team17 asked, for example, that all downloads of their games be removed, and they were indeed promptly removed). As such, I hold this site in somewhat greater respect than other so-called abandonware sites.
They have also proven themselves by being chosen by several bigwig developers as the distribution channel of choice for some big official freeware downloads.

I myself make sure to maintain contact with many developers from various big-name (or used-to-be-big-name) developer houses, and I hope that I have also in some small way contributed to those companies taking the decision to make some or all of their previous hit games freeware.

I do also maintain links to those classics on another forum, to which I will link if the mods deem it appropriate.