Correction: WebWork2 DOES NOT (quite) Embed Struts
Jason has corrected me -- WW2 doesn't use any commons-*'s except for the logging, and apparently "Most of the Jakarta commons stuff is crap". I am corrected, chastised, and laughing =)
For what its worth, the WebWork2 I downloaded (and use -- it is a good tool) from their distro site (java.net) has commons-beanutils, commons-collections, commons-digester, and commons-logging. I guess because they are in lib/optional they aren't actually used anywhere -- just distributed for the fun of it ;-)