Jeff has already mentioned one interesting consequence of the Liberal/Green alliance.
And I have argued in several places that the best thing Dion could do for the Green Party would be to support Elizabeth May's attempts to get into the leadership debates. Well, this morning the "blogging editor" of Halifax Live has suggested a "sure-fire" means of achieving this result. Dion could "entice" one of his retiring members to join the Greens!
Honestly, I don't know how practical something like this would be, but it is vastly encouraging to see Greens and Libs trying to think their way into a genuinely new kind of politics (whereas the NDP seems to have become the party of the old days and the old ways).