There is a 2GB minimum, but my experience with Lion makes me totally agree. 4GB minimum for standard performance. Even with Snow Leopard, if you can go to a maximum of 8GB then do it. RAM has rarely been as cheap as it is now. My MacBook Pro (Early 2011) palpably sped up when I went to the full 8GB. Mac Pro users should try going above 8GB as the kernel starts to scale the maximum limits of things like processes.
The vSphere 5 official stuff has confirmed what badtux said. This article raised everyone's hopes for nothing. It's just the first time vSphere has supported Apple Xserve hardware. Kind of late to the party. Very odd, considering it was already defunct.
It should be supporting Mac Pro Servers. They've got a bit on the logic board which identifies them as a Server rather than a workstation. The Mac mini Server has one too. This is just an ID bit though. Anyone with AASP...
GOLDEN not Gold!
Also Guiness would like to talk to you about the world record for longest sentences.iCloud will not be built-in to the initial release of Lion as iCloud doesn't launch til Fall. iCloud will be a separate update/install.
400MB/s is quite rubbish by today's standards. This is an odd article. It's as though it's something special. It's just an indication that the new Sandy Bridge chipsets include SATA 6Gbps. It's actually disappointing to see Apple only provide 400MB/s. They should be providing 520MB/s or better. Also it is the IOPS that are important to, for every day usage. I bet you the IOPS on the SSD they provide are rubbish by today's standards too.
Apple has a history of being behind...
Yep, I wouldn't expect Apple to release a new Mac Pro until the Sandy Bridge-E chips are available. The non-E ones do not compare to the level normally used. To use current non-E Sandy Bridge would be a downgrade. Sandy Bridge-E not due til Q4 as Marvin said.