It would appear that Xmarks is a good fit for LastPass. LastPass already deals with cross-browsing syncing and I would assume that their backend hardware would be generally 'compatible' with whatever requirements Xmarks has.
So if LastPass already has a viable Freemium model, then they should be able to integrate Xmarks into their business plan fairly easily.
So if LastPass already has a viable Freemium model, then they should be able to integrate Xmarks into their business plan fairly easily.