Well, unfortunately it's been a while since Minh Truong (with the Aldiko team) told me that they planned to add OPDS support to their program.
I guess their energies are focused on the opcoming tablets, either Android-based like the Adam or maybe the iPad ...
Anyway, I'll tell him that I have an sad Aldiko user here on MobileRead
In the meantime, can't Aldiko be set up to be the application that's launched when you click on an epub URL in a browser ? Do you need a specific URL scheme to be set up, like Stanza with its "epub://" ?
Thanks for your patience,
David.