Tommy Widenflycht aka CMOTD released a new version of YASC! The changes for Release 4 are:

– A new levelset in XSB format is included (grigr.xsb)
– Express moves, go as far as possible without pushing with one keystroke. See the controls section for more information.
– XSB file format support. Now every (almost) levelset can be played without conversion.
– Sounds! User configurable!
-” Seamless” walls! Very nice IMHO! – Small fixes and additions here and there.
– My “Rasta” skin have been redrawn/upgraded.

http://www.cs.helsinki.fi/u/jikorhon/condev/cmotd/