FYI, you can see the mod history notes by viewing the header comments in rss2.php in the latest version of Andrew's RSS2 mod (v.1.57 released 12-15-06) (not in the readme):
WoodyVer 1.5.4:
1. Add Google Base namespace (http://www.google.com/base/help/rss_...tml?hl=en_US);
Ver 1.5.5:
1. Add price & currency tags (http://base.google.com/base/help/attributes.html);
Ver 1.5.6:
1. Add cPath parameter to 'categories' feed;
2. Some code optimization;
3. Fix link bug;
Ver 1.5.7:
1. Use $_SESSION["currency"] and $_SESSION["languages_code"];
2. Some code optimization;
3. Fix '&language=' bug;



The basic reason - complete absence of interest to rss2. Probably because of misunderstanding importance of this marketing tool.
