Automating MP3 conversion Options

[Blutarsky]

I have started ripping my CD library using FLAC format, as my main music archive.
Once done minor adjustments are performed: tags editing and cover art.
As the FLAC archive will have its MP3 counterpart for portable devices usage, I was wondering if there's a tool (command line would be fine as well) to automate generation of MP3s.
The tool should:
- scan the FLAC archive (folders & subfolders)
- generate MP3s only for new/changed FLACs (since last pass), creating the same folder/subfloder structure

Any idea?

[phofman]

Since you do not mention any OS, should you use linux, there is the wonderful mp3fs filesystem which produces a virtual MP3 directory tree out of your flac archive and does the flac-mp3 conversion on-the-fly when accessing the files. It works very good for me. Since the resultant MP3s are aften written to slow flash memory of portable devices, the format conversion does not bog the copying procedure.

http://khenriks.github.com/mp3fs/