The nice thing about a hacksession, is that you have something to write about. Below a screenshot of a
Ugi reaction in
Bioclipse... note the
source tab of the editor, which holds the CML. Now, JChemPaint can do reactions too (I did that in 2003 in Peter's group, but seems to be offline at this moment), but this was the quick hack to do the CMLReact in
Google Docs (or soon to be):

And this is us
this afternoon: