since using omniweb sneakypeeks i recognized that my disk space was decreasing slowly. first i discovered that omiweb's disk cache in ~/library/caches/omniweb was growing to about 20 MB (i set "limit disk cache to 0 MB" in the history preference pane"). flush cache helped to get back my 20 MB. but still disk space was decreasing. i discovered, that the folder ~/library/caches/quicktime was about 100 MB in size. maybe this was caused by omniweb? because i never had this before using OW 5.5 sneaky peeks.