There are some semi-new Mountain Goats songs available at Daytrotter. I encourage you to check the page that the tracks are hosted on. Provided are background descriptions for each of the tracks. The one fault I find is that the last track of the session, "Babylon Burning," was only limited to 1000 downloads.
Pinklon
Ethiopians
Red River Valley

Also, Pitchfork recently posted a news bit on the John's new album, coming out in early 2008. Looking at the track list, the album appears to be a reversion to the past quirks of We Shall All Be Healed and before.

Heretic Pride:
01 Sax Rohmer #1
02 San Bernardino
03 Heretic Pride
04 Autoclave
05 New Zion
06 So Desperate
07 In the Craters on the Moon
08 Lovecraft in Brooklyn
09 Tianchi Lake
10 How to Embrace a Swamp Creature
11 Marduk T-Shirt Men's Room Incident
12 Sept 15 1983
13 Michael Myers Resplendent

Noticing the strange likenesses between pictures of Mr. Darnielle is quite addicting.
Also check out this page for other links to free downloadable mp3 tracks by the Mountain Goats.
Other great nuggety findings spliced with the latest images from the latest NYC adventure:
A great bit on Destroyer

A special blog discovery

A New York Times article whose associated picture dominates

A web community for remixes and mash-ups
Another side project by members of Frog Eyes and Destroyer
That side project's super-duper non-myspace page
A link to a track by that side project courtesy of The Devil Has The Best Tuna blog