For the moment you can get the command line tool here:
Zip (157K) 7-Zip (130K)
The readme can be found here and in the downloads above.
EDIT: updated 05.10.2007
EDIT: another update 10.10.2007, mostly to the library, still need to upload the actual program. Added some more info the the library docs, see link further down.
EDIT: program updated 11.10.2007
For the moment I highly recommend you make backups of any files you edit with this. I've tested it, but chances are I've missed something.
- adding, removing and printing individual entries
- exporting .tbl files to .txt files
- importing from .txt files back to .tbl files (see the ".tbl Editing With DTbl" section of the readme for more info)
- general .tbl stats
Also the package compiles under Linux and might compile under Mac OS X, if you have Boost C++ installed.