I use two free programs from
www.processtext.com that convert files from PDB and LIT to HTML or RFT. They will also convert it to FictionBook or RocketBook. As a long time user of a PalmOS phone I have amassed hundreds of PDB files that I am now converting to RFT for the Sony Reader. The output from the converter needs little or no editing as you can specify fonts, sizes, and attributes for headers, subheaders, and body text in the options. It also allows me to download LIT books and convert them as needed.