I ran across a link in my email recently that was interesting, so I continued reading it. EDS has received a "Strong-Positive" rating from Gartner. This comes from the 2007 release of their "MarketScope for Data Center Outsourcing, North America".
EDS was one of 17 companies evaluated and manages over 100 data centers worldwide. Check out their press release here
I of course didn't have a spare $1,995 laying around for the full report, so I searched around - and found a good summary of the report. Unisys was listed on the report ("Positive" rating) and had the summary on their web site. There were a few companies I didn't recognize. I suppose I think too much of the colo companies and not those providing a data center as an outsourced service.
I wish I was able to purchase the report - it looks very thorough and does a nice job of spelling out the evaluation criteria and market segment. Here are some of the companies (with links) that were evaluated in the report:
Vericenter (recently acquired by Sungard)