From what I can see, Montreal has a general weakness in their organization at RW. Kovalev is aging and is an UFA coming this summer, and in the future Latendresse would be a stretch to be a first line RW and D'Agostini and Kristo don't project to be that great either. Kostopoulos and Laraque are both 3rd/4th line players. Philadelphia's goaltending prospects are laughable, and with the recent play of Biron and Niittymaki, the future doesn't look that bright. So...
To Montreal: Claude Giroux
To Philadelphia: Jaroslav Halak
Analysis: Giroux has 1st line potential as a RW, and fills a gap in the Montreal system as an explosive offensive RW who is good at both ends as well. Philadelphia gets a young goaltender who could step in this year or next. Feel free to critique the proposal as you see it.
...if they throw in the rights to Valentenko - it's a deal!