I've just posted a test of the SeaMonkey launcher for the upcoming 2.0 release. SeaMonkey (formerly known as Mozilla Suite) is an internet suite with a web browser, html editor, email, etc. It's what Firefox, Thunderbird and Sunbird were originally based on. It looks like they're finally implementing the -profile switch that allows it to become portable. So, I've put together the launcher for it.
You'll need to supply your own copy of SeaMonkey since SeaMonkey 2.0 is in alpha stages... and everyone is using and alpha or nightly build (which makes it silly to ship with a copy included). Just download a zip of a nightly release or a zip of the current alpha build from the bottom of this page and copy all the files from the seamonkey directory within the zip file to the SeaMonkeyPortable\App\SeaMonkey directory.
Download SeaMonkey Portable Launcher Test 1
(may take a few minutes to hit the download servers)
SeaMonkey Portable 1.x? Nope. SeaMonkey 1.x doesn't support the profile switches or structure we use in Firefox, Sunbird and Thunderbird. It has a messy binary configuration we'd have to update, replacing any local profiles, on each launch. So, we're waiting on SeaMonkey 2.0 to be released for the official portable version.