In a repeat of last year's Summer of Arcade offer, Microsoft are offering discounts if you buy several of their big new XBLA releases.
If you buy all 5 of the following titles, you'll receive 1200msp back, or you only purchase three you get 400msp back.
* Limbo - released July 21
* Hydro Thunder: Hurricane - July 28
* Castlevania: Harmony of Despair - August 4
* Monday Night Combat - August 11
* Lara Croft and the Guardian of Light - August 18
All 5 games will be priced at 1200msp each.
Disclaimer: doubt i'll be buying all/most of these myself, but hopefully this is useful to someone.
Limbo looks interesting from the brief look i had.