Well David Cook has created a software package that works with ExpressPCB files and then produces a set of gerber files. He also has added features that ExpressPCB doesn't offer but the main advantage to me is the Gerber file outputs. You can output the files for toner transfer, or files for direct to manufacture. The software is free but you have to buy the studio version to get the Gerber output. Studio version costs $49. So for a one time fee of $49 instead of a project fee of $60 you can now get Gerbers from your ExpressPCB files.
Check it out at this link CopperConnection.