Thanee said:Knock was more of a "dunno what to take here" choice, but so far we have neither another wiz/sorc nor a rogue, so it might be ok.
I'm not sure about the new Cat's Grace and the like... don't know, if they are worth it now, there are just too many spells to cast at the start of encounters, so these will be used rarely if ever, I suppose... and I havn't found many other 2nd level spells of interest (maybe Levitate? Rope Trick?).
Personally, I really like Glitterdust at second level. Prevents people from going invisible for a while and blinds them on a failed will save. Since it affects an area, you don't have to know exactly where they are when you cast it either.