I agree that you would be well advised to avoid "curricula" per se with little ones. However, that doesn't mean that you need to be cast adrift if you're feeling like you want a little more guidance with regards to activities and organization. Sometimes all we need is a little push to open up our imaginations!
I've enjoyed the Everything for Winter
/Fall/Spring books very, very much. They have all kinds of songs, activities, games, recipes, crafts and so on geared for the preschool set. Every library I've ever used has had copies. Some of the activities are geared toward groups and others are more one-on-one and almost all can be adapted for your specific needs.
You might also look into Everybody Has a Body
and Mudpies to Magnets
. These are both science-related activity books for younger kids and chock full of interesting little projects that are easy to accomplish with household items.
Some other titles I like:
- The Children's Year (Cooper and Rowling)
- All Year Round (Druitt and Rowling)
- Festivals, Family and Food (Carey and Large)