To fix the Object Reference Error simply open the Webmodules/Admin/EditUser.aspx.vb file. Then in the btnSave_Click method change all the variables of thisUser to editUser.
Recompile and it should work properly! I'll post a new zip file sometime this week.
Sorry it took so long to get an answer back, I've been hella busy lately with building my new house.
One interesting note is that I had uninstalled sql server 2000 to play with the sql server 2005 CTP so I either had to install it again or try to run the db installer against 2005. I ran the db installer against the 2005 CTP and it worked fine! You just have to be sure to set the EasyUser accounts password to a strong password after the installer runs if you have that server option on and update the dataconfiguration.config file. Enterprise Library had no issues running against the CTP as far as I could tell in my limited time. This should take some of the burden off converting this bad boy to .net 2.0/sql 2005.