I thought Martha started a thread on this, but I couldn't find it. Several changes in HSA's kicked in on Jan 1, including removal of the deductible-based limit on contributions.
Now everybody with an HSA can contribute the max ($5650 per family in 2007). I had to read through a lot of verbiage to determine that the limit is not retroactive, so if you haven't made your 2006 contribution, the limit is still the same as last year.
You can read about the details starting on page 76 of this doc: