Dd now 3.5.
For the past 12-18m she has consistently played with Duplo (& now some Lego added), her wooden railway set, Happyland and her "babies" and associated accessories (buggy, clothes, cot). Her kitchen, shop, food and utensils are probably the most used - alone, with us or with friends, and now with 11m DS too, who has been taught to cook, pour tea and eat, but gets screamed at if he pushes the trolley! Books and jigsaws get used every day but particular ones fall in and out of favour.
Balls and her scooter are everyday outdoors items.
Basically I'd say that the most popular toys over the past year are ones that have allowed imagination, self-expression and growth. Most of them needed a high level of adult interaction at the beginning and now she plays mostly on her own near us, but asking us to comment/praise or join in when needed (tricky fastenings, complex puzzles, 'eating' the cake she's 'cooked' etc).
The crap toys (imo) have been the ones requiring sustained adult input (not possible with a baby too) such as wind-up things, fiddly bits that keep falling off, branded ones that tie in to tv programmes she's never seen, or stand-alone toys that hold her attention for maybe 10 mins but then there's nothing more to be done with them. Cuddly toys are a waste of space too - she has millions but doesn't play with them. I put a sackful up in the loft 4 months ago and she hasn't yet noticed their absence.