I filed a ticket to ask our IT folks to upgrade PHP on our virtual machine server. Turns out the easiest and safest way to do that was to upgrade the entire OS and all dependencies, so we scheduled that for this afternoon. They just finished upgrading the server, and we now have a shiny RHEL5 box running PHP5. That means next week I'll be moving our TLC website onto the VM, as well as migrating wiki.ucalgary.ca (and finally upgrading it from 1.6.10 to 1.13.0) Woohoo! Our IT folks really are great. Thanks!