I'm looking to host a potentially busy wpmu install. It will start out small but grow over time. I was thinking of liquidweb.com because they have well priced managed hosting packages (cheaper than rackspace) but I'm not sure how friendly they are with wpmu, I'm running one wordpress with with them there now to test it out, and it is pretty good so far.
I'm also thinking of using dreamhost. I've hosted many domains there in the past, and am quite happy with their system. but does anyone have any experience with their Dreamhost PS service. looks good, and scalable, but who knows.
and there is also bluehost.com, which is recommended by wordpress.org.
does anyone have any comments/experience with any of these, or can they recommend any other hosts that are good. In the end i'll probably be running around 4 or 5 medium traffic wpmu installs. and handful of other domains. nothing too high traffic.