Fudge Packer is an asset auto-packer for Portal 2 that inserts itsself into the build chain and auto packs custom textures, sounds, music, models, etc. Unlike other autopackers, FudgePacker lets you build and pick one or several lists of assets (in .txt files), and will auto pack them when you compile from Hammer.

Whats more it supports the builtin PTI and external Hammer editors, and automatically removes the 1750 entity limit on PTI maps. (Patches to 2048) – so no more failing to find sub VMF files referenced in your .VMT.

You can find the original Release thread here:
http://forums.thinkingwithportals.com/community-releases/fudgepacker-t6692.html

Or grab a copy over on Portal2Maps:
http://www.portal2maps.net/2067/fudgepacker-0-4-with-hammer-intergration.html