Until the 18th of May, Show Me The Games is orchestrating a collective sale of 32 indie games. Show Me The Sales games include Voxatron (50% Off), Scoregasm, Darwinia, Gratuitous Tank Battles, and Offspring Fling. If you haven't grabbed a copy of Voxatron, you can get it this week for just $7.50 (along with a bonus copy of Swarm Racer 3000 Prototype).
The interesting thing about SMTS is that it is not run by any particular portal or distributor; all of the discounted games can be purchased directly from the developers. It has become usual and expected to buy games through some kind of store (e.g. Steam / App Store), and it's easy to forget that there was a time not so long ago when most indie developers didn't need to rely on such middlemen. Apart from allowing players to support devs without losing a big chunk of each sale to the reseller, being able to sell direct has a great influence on diversity and reduces the need to design games around potential sales channels. In other words, allowing indie developers to really be independent.
The current state of the market is not terrible -- it's still possible to sell indie games via channels that treat developers moderately well, and for niche games to find their audience. However, this could turn to custard very quickly and without warning! SMTG is just a way to fight back a little and keep the most indie-friendly channel alive and in the collective consciousness of indie game supporters. That channel is ... The Internet!