http://windjview.sourceforge.net/
A viewer for .djvu eBooks.
GPL license.
Small app (~500KB download for .exe installer) 
Would be useful in a similar way to SumatraPDF - obviously .djvu is less common than .pdf but anyone with a djvu file would suddenly find this *very* useful!
Not yet tested (just downloaded, currently running Linux) but the installed folder might be near-portable as it is.
Any questions/feedback welcome, all programmers worshipped...
UPDATE: The downloaded file is the app itself, but it is saving settings... somewhere... (window size & location, not sure what else).
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It stores all of its settings in the registry "HKCU\Software\Andrew Zhezherun\WinDjView\". Should be relatively easy to make portable. The author has stated that support for saving settings in an .ini file will be added in the next version of WinDjView, but it's been quite a while...