I've committed a snapshot of ASDF2 [in trunk][1], including [a copy of the texinfo manual][2].
[1]: http://trac.common-lisp.net/armedbear/changeset/12618 [2]: http://trac.common-lisp.net/armedbear/browser/trunk/abcl/doc/asdf/asdf.texin...
A potential gotcha for moving from ASDF: there is a translation mechanism for FASL locations in place by default (this code supersedes the ASDF-BINARY-LOCATIONS addon), so your FASLs end up in a central FASL cache by default.
This output mechanism is *very* configurable, see the manual for examples. To totally disable output translations, one can simply eval
(asdf:disable-output-translations)
after loading ASDF2.
With output translations, one may have the problem with code that wrangles *LOAD-TRUENAME* or *LOAD-PATHNAME* to get the source directory. The official ASDF2 recommendation is to rewrite your code to use ASDF:SYSTEM-RELATIVE-PATHNAME, possibly utilizing the presence of :ASDF2 in *FEATURES* to conditionalize old code. Examples of such definitions can be found in my patch as I adapted our ASDF definitions for test code.
We still have to solve the problem arising from the possibility of not having a writable filesystem in an applet or servlet context, but that problem was present with the old ASDF as well.
Anyone with problems in using ASDF2 please let me know. I have tested it quite a bit in the past months finding it generally much improved. The ASDF group is quite active in fixing things, so please be vocal and we should be able get you to a stable state.