$22 FPGA-Based Logic Analyzer Packs a Punch

The FPGA-based SUMP2 logic analyzer is useful for large FPGA development, but is also able to scale way down to work on a $22 Lattice iCEstick FPGA+USB board.

from EETimes: http://www.eetimes.com/author.asp?section_id=216&doc_id=1330689&_mc=RSS_EET_EDT