Not too long ago (May 2011), the Italian Wikipedia switched from its traditional vote-based deletion process to an open-ended discussion process (so called "consensus") similar to en.wiki's (lege: chaos) Some data is available about the effects and just waits to be analysed: https://toolserver.org/~mauro742/liste/pdc_stats.csv , in response to my requests https://jira.toolserver.org/browse/DBQ-190 and https://jira.toolserver.org/browse/DBQ-192 . The CSV is fairly self-explanatory but there's some more explanation at https://it.wikipedia.org/wiki/Wikipedia:Elenchi_generati_offline/Richieste/Archivio/2011#Lavoro_per_le_PdC (in Italian; if machine translation doesn't suffice and you want more, just ask).
The maintainer of the deletion process maintenance bot is updating its software due to the future death of the Toolserver; he asked what sort of statistics would be most interesting to collect and expose on a regular basis. Suggestions?
Nemo