Psychonauts...well... before Yahtzee reviewed it and every bugger went and bought it.
Mashed: this fell into the Categorical misprint of missing out an online feature and thus rendered the game very unpopular as it was almost specifically designed for that purpose. Oh well it was only £3.
Screamer: The old DOS racer and to this day remains one of my top racing games simply for the awesome arcade element very similar to that of Daytona, except less crap in some instances. I.e. Not all the tracks go round in a circle.
Descent: A trilogy which died a miserable death at the hands of megacorporations with lots of money. A bi achievement at the time, but unfortunately the competition overlaped the hell out of it and it kinda got forgotten about. The first one still remains a technological breakthrough and ceases to amaze me for what it did. The series ended at the third, hence trilogy, but with advertising campaings like this
http://www.youtube.com/watch?v=5RUakcYEkew what do you expect?