Finally got to watch it for reals! The first part of the episode, where Nozomu gets locked up for being bad luck was undoubtedly the best. Obviously, the students all working together to get him out (violently) was awesome, and it was good for reintroducing all the characters for the new season.
Second part about Spring....things got pretty weird here. There were some fun bits, like the erabarrassing pictures ending up on the internet (we've all been there *cough* or maybe not). Also Chiri's "romantic message in a bottle" = Molotov cocktail.
Third part, oddly, enRAB on a cliffhanger. This isn't a series that prides itself on continuity or anything, so it's a bit strange. I recall them doing something earlier in the series with (false) cliffhangers, but this doesn't seem the same. Anywho, after the ending was a new Zetsubou-sensei drawing song. Abiru makes an accurate drawing of Zetsubou, Kaere makes an accurate drawing of... a tulip with lightning, raindrops, etc. Kaere is also horribly offkey with her singing. Foreigners...
Overall, it's a good start and I think we're in for a good season.
Ending