Today IBM announced a lot of products out of the Virtual Fabric Architecture like Blade HS21 XM (8 memory slots instead of 4), Cisco SAN Switch (industry first Cisco SAN switch specially made for a blade environment) and the Multi-switch InterConnect Module (MSIM) which can give you 8 I/O paths instead of 4.   You can get these announcement by email yourself if you select the announcements you want to receive through IBM e-News.