I have quite a few dvds i havent watched in my collection yet and i would like an easy way to filter them from the dvds i have watched.  One way i noticed was to create a user and then set the dvds to watched that i want...

the only issue with that i have is if my hard drive crashes and i lose my current install of dvd profiler...does the details about what i have watched and havent get saved on Invelos' servers or would i need to re-enter this information all over again?  It would be nice if you could just edit what headers are available so that i have "All", "Watched", "To Watch", "Ordered", "Wish List" instead of "All", "Owned", "Ordered", "Wish List"...i realise you can do it witch phpdvdprofiler but what's the point of having paid for the unlimited account if i'm using a different program to take care of my collection

I can only re-state what kdh has said... the online My Profiler is an EMERGENCY solution only. You should take proper, regular backups which will restore ALL your data.
Personally scanned covers do take up a lot of space so (if you have a lot of them you do yourself and don't get from the main database) an occasional full backup to CD or external drive is a good idea but for all the "watched/price paid/personal/etc" data you can just do a backup without cover images.

This will take up about 15K/title (so not that huge) and is easy to stuff on a memory stcik, email to your work and store it three, uploead it to some webspace you have through your ISP etc. I personally usually do a backup a few times a day (when I've done any significant changes/updates I don't want to lose) and send/store it at the end of the day so I am never more than 12-24 hours out of date.

Fow watching purposes why don't you just filter on stuff you have watched, flag them, unfilter, reverse the flags then set a Tag called "To Watch" for all flagged entries.
The just simply filter on "To Watch" every time you want to check what is on you 'to watch' list.

The header changing idea has been suggested but FWIW, the sections are specifically optimised for their intended purpose so just allowing changing of the header would only lead to "but I can stil only see priority in this column, and it doesn's give it a clooection number" etc.