BTW, last october, in the tcl/tk conference that I attended to, it was mention that Tcl 8.5 will support the main OO features, based on XoTcl. So, when you have Tcl, you can write normal Tcl scripts, or use the OO syntax. Anyway, the release of Tcl 8.5 shouldn't stop us to embrace XoTcl for our toolkit, but give us a good view that XoTcl is the right OO extension to choose for OpenACS, besides that Vienna is providing the code!
Probably for a next 5.2.x release I want to propose to make OpenACS XHTML compliant, that is not that hard at all.
For 5.3 an integrated support of AJAX within the templating system will be good. Also, include WS external query execution within the db_* API. And a way to put your applications instances in "view only mode".
