Oh the glory of custom ROMs. Bringing in many new and creative features, that would just take too long to be implemented on official releases for the inpatient, we are all thankful for these ROMs. CyanogenMod has now released a version that allows lockscreen gestures.
Lockscreen gestures will allow you to not only unlock your device with a drawing, but upon doing so, you will be instantly directed to the application in which that gesture is assigned. So you can set a certain set of swipes to open up the Android Market, and draw a letter to open up TweetDeck, the possibilities are essentially endless.
You can check out the ongoing discussion with download links and instructions over at the CyanogenMod Forums.
Note: If you are using the Lockscreen gestures in CyanogenMod, set your sensitivity to 3 or 4 for the best results - if it's too low, you're going to have problems.