With the release of Dead Space 2 in a few months, EA have announced a prety nice deal for those looking to get the game on the launch date.
If you pre-order the game, you will also get the PSN/XBLA Dead Space Ignition game completely free. This game is important for those wanting to follow the Dead Space storyline as it provides links between the two games. Also, after completing Ignition, you'll recieve a code unlocking a hacker suit for Isaac to use in Dead Space 2.
Ignition can also be purchased separately for $5 although if it's pretty certain you're getting the sequel on its launch date, you might as well hop on this deal.
It's also worth noting that if you buy the PS3 version of Dead Space 2, you'll also get Dead Space Extraction thrown in, so you could end up getting three games for the price of one.
Ignition is now available on PSN and XBLA. Dead Space 2 is set for a January 25th release.