Have no idea what they've usually got cooking at this Hoxton gallery but if it's anywhere near as good as the Sweet Toof/Shan Hur show on at the moment (January 2011) then hot damn!
http://londonist.com/2011/01/exhibition-review-having-a-dig-sweet-toof-new-paintings-and-shan-hur-at-arch402-gallery.php
In an old station arch, superbly lit and easy enough to find (essentially across the street from Hoxton Station), Arch402 is a killer little art space that I intend to keep an eye on. read more