Whats the most efficient query for this result?

I have three tables (users, books, pencils) and would like to get a
list of all users with a count and total price of their books and
pencils for 2012-01-01...

So with this data...

users (user_id)
1
2
3

books (user_id, price, created)
1 | $10 | 2012-01-01
1 | $10 | 2012-01-01
3 | $10 | 2012-01-01

pencils
1 | $.50 | 2012-01-02
3 | $.50 | 2012-01-01
3 | $.50 | 2012-01-02

What is the most efficient way to get this result...

query_result (user_id, book_count, book_price_total, pencil_count,
pencil_price_total)
1 | 2 | $20 | 0 | $0
2 | 0 | $0 | 0 | $0
3 | 1 | $10 | 1 | $.50