The NYT has a very nice comparison chart of the Senate and House versions of the bill.
http://www.nytimes.com/interactive/2009/11/19/us/politics/1119-plan-comparison.html?hp#tab=15Here were some changes:
1) Kerry repeatedly asked that the threshold on the cadillac plans be raised - he initially had $25,000 (which per articles the unions were not going to oppose), the Finance bill had $21,000. It looks like they split the difference to get to $23,000.
2) Kerry argued that the 4:1 ratio for premiums of the oldest to the youngest was too high. MA has 2:1 and he argued for that. The HELP bill had 3:1 - and the final bill has 3:1.
There seem to be some pretty major differences in the two bills. The most drastic is that the House bill has national plans and a national exchange, where the Senate one in state level - though it allows states to combine into regions. This is a fundamental difference, not something that can be solved by "splitting the difference". I suspect that this was done to win the support of the more Conservative Democrats. (ie North Dakota can have its coop). This really is pretty much driven by the opt out provision. I would suspect that the final plan will look more like this. (Reid, Dodd, and Baucus (and the staff) really did a lot of work here.)
I think the abortion issue was handled as well as it could be. I will bet that the pro-life people will say it is just playing with numbers. One question is what about any people whose subsidy is greater than or equal to the Premium without abortion? If they select the plan with abortion, would the subsidy be limited to the cost of the plan without abortion? (In which case they pay out of pocket the difference in the 2 plans, which is presumably due to covering abortion as well.)