I heard this a lot, also in the manual of some link building software. Actually I find this hard to believe. I myself use the web for many many years and when I look for information regarding "widgets" I almost always go to Google or other search engines and search for it.
Even looking in a widget-related category on DMOZ is very, very untypical for my surfing behaviour.
Are there actual surveys/statistics if users REALLY DO bookmark catalogue-style linklist on "authority sites"?