Major Nelson recently announced some information regarding a sale of Xbox Live Arcade titles during the first week of April, from the 1st - 7th to be exact.
In this time 10 XBLA titles will be going on sale, Major Nelson said,
Between April 1st and April 7th, there will be Ten Arcade Games on sale (like Super Street Fighter II HD, South Park LET'S GO TOWER DEFENSE PLAY and Defense Grid: The Awakening) I'll post the complete list of titles and sale prices as soon as get my hands on it.
As well as this he also mentioned about a free Xbox Live weekend for Silver members during the first weekend of April.
April 1 from 12:00 pm ET/9am PT through April 5 at 12:00 pm ET/9am PT, Xbox LIVE Silver members can enjoy features that are reserved exclusively for Xbox LIVE Gold members - including Netflix, Facebook, Twitter, Last.fm and premier multiplayer features.
So there you have it, don't say Microsoft never does anything for you.