Thanks for the help. I eventually got it all to work. My problem in doing the copy to the SD card was that I don't have a card reader that will work with them. I had to format the card and create a garmin directory on it using a friends computer. After that I used GmapTool to upload the IMG file to Mapsource on my computer and then used Mapsource to send the maps to the eTrex with the card in it.
BTW does anybody know of a card reader that will read and write to both CompactFlash (camera) and Micro SDHC (eTrex GPS) cards when plugged (USB preferably) into a computer running XP sp3?