I may be biased but:
The RTE Election 2007 site has really triumphed for me this election. Firstly I am listening to the radio coverage (far superior to the television coverage) and watching the studio on web cam. That in itself was great but by far the best feature has been the liberal use of rich visual tools for displaying data and great access to that data. Excellent stuff.
If I had a favourite section, it would be Results Extra.
Tired but happy (as far as it goes)