There is an excellent analysis at chaos in Congress, most notably even among the Democrats themselves, on the tax issues. It is at http://tpmdc.talkingpointsmemo.com/2010/11/dems-out-of-sync-on-tax-cut-strategy.php
The key points, I believe are:
The real battle will be to get 60 votes to overcome a filibuster in the Senate.
Along that line then, what, if anything, the House does will be irrelevant.
Amazing really that the Democrats cannot craft a compromise now to get the 60 votes, especially on at least the estate tax.
By Kevin Staker