Maybe this would be a good time to push A-B-L into the ASDF repository? I've always been in favor of this, acnyway, since it's such a critical extension. IMO it would be great if anyone who had ASDF could also get A-B-L with no more work than a call to asdf:oos.
why with an asdf:oos? why not just incorporate the functionality into asdf? (possibly with such default values that preserve the current, imho bad, practice of writing .fasl files all around the disk)
just my 0.02,