Seems Fictionwise is turning more and more towards eReader/Mobipocket books, at least for the books I want to buy

I can read the ereader format on my Palm-device, but I don't want to go back reading on that since I have a 505.
Could some kind person *please* help me with info on whether it's even possible to convert mobipocket format (or ereader) to something readable on my 505? Or even if it's possible to convert to MSreader or html/text - I can then handle it from there...
I have read the "seriouly confused..." thread and other threads I can find, and downloaded some stuff from various places on the net. But I need a "super dummies step by step guide"....
So could someone take pity on me and PM/email me?
Converting from mobipocket is such a different world... I have no idea where to start...