Gavin tagged 0.4 release today, so here are my gitian builds.
These zips are in gitian-download format which means they can be
automatically downloaded and pgp-verified using the gitian-updater
script (see
https://github.com/devrandom/gitian-builder/blob/master/share/gitian-updater). Currently they only contain my sig, but if other devs have time to gitian build and re-roll the same zip with other sigs added as well it would make updating via gitian scripts easy and secure :).

http://dl.dropbox.com/u/29653426/bitcoin-0.4.0-linux-gitian.zip
http://dl.dropbox.com/u/29653426/bitcoin-0.4.0-win32-gitian.zip

SHA1:
3794ec0ce8a3ea96200b3970937c5f224313267d  bitcoin-0.4.0-linux-gitian.zip
a4857b2238a102d8f4ba9a2bdfed74ddd985ad3d  bitcoin-0.4.0-win32-gitian.zip

Email PGP signed as always.

Matt