The Vdara is a relatively new hotel(Dec 2009) located directly across from the Aria. We had booked three suites for my buddy's bachelor party(two of them were connecting). I stayed in the smaller junior suite and I loved the layout(think L shape) with the kitchen at the entrance and the bedb/bath around to the left. One particular feature we appreciated was the double mounted flat panel televisions(one facing the bed and the other directly facing the couch).
When we needed it housekeeping was johnny on the spot and friendly with large smiles even after noticing the numerous bottles of alcohol and shot glasses strewn around the two suites and inevitably the mess that would most likely result from our celebration.
The one knock I would give Vdara is that it's relatively far away from a lot of the action on the strip. However if you're looking for some quiet R&R in Vegas I wouldn't hesitate to recommend the Vdara.