I have just installed XAMPP on Solaris 10 and I must say that I was impressed with the process. It was very easy and so far I have not had any problems. I will begin migrating/testing some of my sites to the new installation shortly and will let you know if I find anything during the process.
Since this is beta software, I wanted to provide some recommendations that you might find useful. Nothing major, just some nits.
1) The Welcome page contains the following:
"If you want to start programming PHP or Perl (or whatever please take a look at the XAMPP manual first and get more information about your XAMPP installation."
When you click on the XAMPP manual link, you are taken to the http://www.apachefriends.org/en/xampp-linux.html page. This is incorrect for the Solaris installation. The correct link should be: http://www.apachefriends.org/en/xampp-solaris.html (which I found manually).
2) I may have missed this somewhere, but I could not easily determine the username/password for the phpMyAdmin utility. I had to go out to the web and with some trial and error, I found that the username was "root" and the password was a generic one that I entered earlier. It would be nice if there were a username/passwords section in the online documentation page.
3) It would be nice if there was a link on the XAMPP main menu that linked directly to the Apache Friends forum. This would allow easier feedback from newbies like myself.
I will continue to post things that I find while playing with it on Solaris 10.