The answers to the quiz (originally in the March Gang-gang) are:

#2 - Welcome Swallow
#12 - Australian Hobby
#1, 5, 7, 8, 9, 13 - White-throated Needletails (note the cigar shape and blunt tail)
#3, 4, 10, 6, 11 - Fork-tailed Swifts (note dart shape, pointed tail; No 6 has the tail feathers open which is not often seen)