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... that is of course, if someone hasn't done that compliation already ;)
google is the most used s.e.: it also provides secondary results to yahoo.it (just released Yahoo Express) & virgilio.it (now PPI)
its db is also used by supereva.it
the second place to submit your site is FAST/Alltheweb, cause it provides results to Tiscali.it, Excite.it & Lycos.it
3rd place for Arianna.it (pay per spidering, but still supports free submissions), with its db & its algo; then MSN.it & Altavista.it.
I don't have an updated top 10, but hope this helps.