BEFORE THE RECENT EVENTS
Israeli deaths through Palestinian violence over the last 7 years:
22 [ref 1] (reference 1 is the most informative article I have read on the
subject and takes great care to fairly weigh the claims of either side.)

Palestinian deaths through Israeli violence over the same period:
5000+ [ref 2]

DURING THE RECENT EVENTS
Israeli deaths due to palestinian violence:
9 [ref 3] (another 4 also died of 'friendly' fire)

Palestinian deaths due to Israeli violence:
1000+ (plus 5000+ maimed and seriously injured) [reference 4]

Ethnic cleansing?

Ilan Pappe - Israel's Righteous Fury and its Victims in Gaza ...
3 Jan 2009 ... My visit back home to the Galilee coincided with the genocidal Israeli attack on Gaza. The state, through its media and with the help of its ...
palestinethinktank.com/2009/01/03/ilan-pappe-israels-righteous-fury-and-its-victims-in-gaza/ - 79k


References

 http://www.zcommunications.org/znet/viewArticle/20269
 http://www.guardian.co.uk/commentisfree/2008/dec/30/israel-and-the-palestinians-middle-east
 http://politicalmavens.com/index.php/2009/01/18/low-israeli-casualties-means-victory-in-gaza
 http://news.bbc.co.uk/1/hi/world/middle_east/7828884.stm