I settled with Mp3 Tag Tools v1.2, dl here

Pro: it works on 8000+ tags and it is by donation,
Con: have not found any yet

To organize my mp3, I was using mp3stock here, click the picture to dl. It is the fastest I have ever seen upto 4999 songs, eye blinking fast. It is NOT very user friendly so one has to play with it for a few minutes to get it. Other than that, I recommend it wholeheartedly, and also it is by donation too.

By donation does not equal to FREE; by donation means the author wants some encourage from user that his stuff is good, usually at least a postcard or 1$ would make the author feel good

When you have 5001 songs, I switched to Advanced MP3 Catalog 3.36, here, it costs $19.99.

Pros: Simple, no learning at all, it is like excel, just install and use, and FAST. It also edit/delete songs from harddrive when you make changes on the database.
Cons: Not really one, but the purchase step is a little bit crumpsy.

I have tried JRiver's mediaJukebox8.0 and MediaCenter 12. They are both fine and loaded with features. That is exactly the problems for me it is way too many features and becomes slow and difficult to use. I think it is by far the most complete media catalog, but one has to learn to use it. Yuk.

Mind to share with the community what engine do you use to handle your mp3s? Again, I pay more attentions to Simple and Fast and excel like interface. Donations or paid are fine.

And yes, these are all windows, not maemos.

TIA,

bun