The first 'link' is the band's last.fm page, the second is the closest link to the download I could get.
Anacrusis - A whole bunch of albums
Progressive/Melodic Thrash band, four full CD's on the website here along with various demos and live stuff.
Avathar - Avathar
Scandinavian black/death metal in the vein of Summoning. Someone once told me they had a full demo or something on here but since I can't read Finnish...
Circle of Tyrants - The Art Of Intensity
Dark Empire - Northern Sky Websingle
Thrashy Power Metal, much like Persuader, Savage Circus, older Blind Guardian. Matt Moliti is a guitar god, just go and get it, then buy the full album.
Evilion - Vanity
Female-fronted Symphonic/Melodic metal nothing like the billions of Nightwish/Within Temptation clones you hear nowadays. It kind of reminds me of Therion because of the occasional operatics. Very well done.
Finntroll - RivFader Demo
Probably the biggest name on here, Finnish folk metal grandmasters' (grandfathers'?) demo CD. This is the link you get directly from the Fintroll Website.
Heathen - Breaking the Silence AND Victims of Deception
Probably the most famous free metal CD's, bay area Thrash group Heathen released their first two albums free a few years ago. After being plagued by so many member changes and shutdowns it's good to see them in the green for a change, this is a damn good band--check out Breaking the Silence if you don't believe me.
Jester's Funeral - Fragments of an Exploded Heart
German Thrash metal, full album released to the public.
Metallica - MetallicA Live
For a large collection of older concerts, complete in .mp3 format; the quality might suck at points but at least the songs are cool. There's over 1 gig of music on there at the moment.
Mistral - Compilation 2001 - 2004
One man's "Melodic Hybrid Metal" project, incorperating aspects of everything from Gothic to Industrial to Gothenburg. He's in the middle of producing a new full album and offered this up as a sampler of sorts.
Skald - Sagor Från Skogstjärnen Demo
Another Folk Metal band, with another demo. However I really like this one myself. It's kind of like a less edgy Korpiklaani.
Warbreed - So Cry Havoc EP
Melodic Death Metal/Gothenburg, hailing from Argentina, who use a lot of World War II themes in thier lyrics. Even if you don't like death vocals check out the last track (instrumental), it's pretty damn good.