For anyone who runs a WordPress blog on Bluehost (as I do), they are currently busy switching all their servers over to PHP 5 and eliminating support for PHP 4 entirely. So far no public announcement has been made to this effect and the switchover is not yet complete for all servers as yet. The results so far of course has been a plethora of broken WordPress blogs caused by "PHP memory limit exhaustion" errors and numerous plugin problems.
Just so you know.
One of the invaluable plugins that just about everyone uses; the "WordPress Database Backuop" plugin, version 2.1.4 is apparently not compatible with PHP 5 and can cause the entire site to crash. A new update for 2.3 is out but I haven't heard from the plugin author about it's compatibility with PHP 5 yet.