J.B.
About 8 months ago we got my DD (22 mos) the LeapFrog alphabet refrigerator magnet set. They can slot each letter into the little electronic base and it sings a song about the letter, as well as singing the whole alphabet song when they hit another button. She LOVES it and would stand there for 10-15 min at a time and just slot in letter after letter. Now she knows the whole alphabet song and can recognize and tell you about 90 percent of the letters. Picks letters out on written materials all the time now. For my baby anyway, it's the coolest toy EVER.
I got her a used Step2 table and chair set on craigslist and she uses that every day. Mostly I cover the table with paper and she draws all over it -- oh, there's an indispensible item: the Crayola washable markers and crayons. AMAZING invention. :-)
Also, for my daughter, anything Teletubbies: She loves her little playset and her DVDs/videos (got a lot of them used) and her talking Po doll.
She's just now getting good at shape sorting, so she plays much more with the wooden block set with the shape-sorting lid my husband got her a year ago. He bought a huge tub of multicolored blocks and she plays with those every day now.
If your daughter's tall, skip the riding toys and get her a tricycle. Radio Flyer makes little teeny ones. DD has one that some friends gave us after their daughter outgrew it, but she's not quite tall enough and it frustrates her to no end that she can't ride it. (It's in the garage, semi hidden and folded up [yes this model folds up for storage], but she knows where to find it and she still tries to go play with it.)
Finally, I got DD a little wooden stool at Albertson's, and she plays with that thing every day now. Carries it around the house, uses it to climb up and over the back of the couch so she can flop on the pillows (supervised, of course0, brings it into the kitchen so she can climb up and see what we're doing on the countertops (which is what I bought it for), etc.
Hope this helps! I can't wait to see what other replies you get! :-)
J.