[leeharveyosmond]

5.5.4 (v607.17) 10.4.9/PPC/haxies are evil

% ls -1 ~/Library/Caches/com.omnigroup.OmniWeb5/Page\ Icons/ | wc
17319 17319 318813
%

The page icon cache was up to 67MB; the WebKit cache was up to about 14MB. OW appears to be caching a separate page icon for every page visited, when most sites are using a single common icon.