Well I've had my Linode for about 5 months now. I've been slowly testing and tweaking to see if I could in fact move everything from my dedicated server to a VPS.
With the help of one of the best communities, I've done it. I've managed to run what took a dedicated server with over 1GB of RAM on a Linode 360 with resources to spare.
-1 Drupal site, 2 Gallery sites, a few PHP sites, and some "parked" domains. ~170,000 hits per month altogether. Virtualmin for management.
The performance is excellent. The support is there when you need them. The community (forums, IRC, wiki) are all great.
FWIW, here's the benchmarks on WHT I ran for my
dedicated server and my
Linode 360. You can see how bad my dedicated server was running. Pretty sure it was powered by hamsters...