I personally like the HP ProLiant servers and Solaris OS. However, I do question MySQL's future since major contributor left Sun to create his own company to support MySQL. I have to wonder how will it'll affect MySQL in terms of trust and support if the major contributor is no longer with Sun?
My logic behind this with MySQL what kind of issues did the guy have with Sun before he left? Some things he didn't agree on it's future? Or he feels he is better off without Sun's support?
I wasn't too thrilled when Sun bought out MySQL as it was a great community supported product. It came a long way to rival Microsoft's SQL servers and biggest point of MySQL is no licensing issues to deal with as it was free.
Anyways, I wish HP and Sun the best of luck in this partnership.