For me lot s of user use chinook repository on diablo, and the chinook one contains some packages that you shouldn't install on diablo.

At this time, home applet on diablo available is homecpuspeed, homediskfree, and homememoryfree.

This applet update every 2s when there are in background and do nothing when there are in background or device idle.

So no more battery drain. But don't install python2.5-hildondesktop on diablo it was made for chinook, and don't send some events on chinook ! Like when tablet idle ...