C20 really seems to be the format most noise-folks gravitate towards, here are some shorter efforts that work well for me...
Weak Sisters - Slow Fire (Ekhein, 2008) - C10 - perfect dose of Weak Sisters cuts and stabs, probably the tape I go back to most, whenever I put this on, I have this stupid grin on my face, great minimal artwork as well
Without Belonging - S/T (Monorail Trespassing, 2005) - 2xC10 - beautifully packaged, not necessarily as good as the "Solace" tape from the following year but works regardless
The Cherry Point - Dark Sanctions (Throne Heap, 2006) - C10 - hard to believe but the Cherry Point does work well when administered in small doses, mostly have downloads of the older material but there are a lot of interesting examples of short tapes, biz cards etc.
Ahlzagailzehguh – Problems With Preventive Medicine (Hospital Productions, 2005) - C10 - great way of getting a taste of Ahlz, cut up noise seems to work very well in this format since it allows for making things sound "rounded out" in a way