I have problems dumping tables with Konqueror (phpMyAdmin 2.2.2).
With Konqueror 2.1.1: plain dumps, zip and gzip dumps work ok, except that the proposed file name for the dump is always 'tbl_dump.php'. bzip2 dumps don't seem to work. With Konqueror 2.2.1: plain dumps work; zip dumps are placed into the user's temporary directory, so they must be moved before closing Konqueror, or else they disappear. gzip dumps give an error message.
Testing needs to be done for Konqueror 2.2.2.