I've compiled PHP and Lighttpd from scratch on the tablets with no problem... I disabled most of the modules I wouldn't be using, but it's possible to compile them without too much issue. Of course if there's already stuff in the repos, then great go for it since it saves you hassles and work, but if you are looking for a specific PHP build/config/module or lighttpd I've got 'em on my tablet right now... I could probably deb 'em up if somebody's really desperate for something they can't pull out of the repos, but I provide no promises that they'll work flawlessly for you...

-Rob