Yes, I have just recently come across this fine looking piece of software. I'm currently toying with the Trial and am so far loving it, specially that it handles videos and allows you to enter information for them into the Database, something that eases the pain of there not being an ID3-esque tagging system for video files. iTunes I recently found out did something similar but was displeased with that software when I realized it wouldn't play half the formats I had, so I was definitely pleased to find that Media Center plays pretty much everything I have.
There is however something I'm missing in your software. In some other forms of media players and Music Taggers, in their rename function, they have a function known as "If Statements." It would seem that yours has no such thing, though I find it highly useful and thus would love to see something like this in this great software.
What I mean is, for instance in another program I have used, you could use the mask of "$if(<album artist>,<album artist>,<artist>) - <title>" or "<artist> - $if(<track#>,<track#> - ,)<title>"
With example one, if the file had an Album Artist in the tags, then it would name it Album Artist - Title while if it only had an Artist, then it would place it as Artist - Title, and with the second it would place Artist - ## - Title if it had a Track Number bu leave out "## - " if one was not present.
Any chance of something like this being added in the future? Or maybe it's already possible and I'm just overlooking it in the help files?