1. cmd5.org (paid service)
    MD5, Double MD5, Double Binary MD5, and SHA1
    ">24,000,000,000,000" MD5 (2 ^ 44.448)
    >24,000,000,000,000 total (>2 ^ 44.448)
    They have 160 TB of disk and 24 trillion (6.67 bytes/password). They are getting closer to 3 bytes/password. Once you start going less than 3 bytes/password it gets kind of slow. They used to have 80 TB of disk and 7.8 trillion (10.26 bytes/password).

  2. MD5Decrypter.co.uk
    NTLM, MD5 and SHA1 (plus some MD5x2, MD5x3, MySQL, LM, and others but these only account for a few million passwords)
    43,745,000,000 NTLM (2 ^ 35.348)
    43,745,000,000 MD5 (2 ^ 35.348)
    43,745,000,000 SHA1 (2 ^ 35.348)
    131,235,000,000 total (2 ^ 36.933)

  3. Nitrxgen.net
    MD5
    128,940,809,987 total (2 ^ 36.908)

  4. TobTu.com
    MD5
    50,529,455,839 total (2 ^ 35.556)

Honorable mentions:

If someone wants to give me a 4U server with 24, 4 TB hard drives in it (or around $6,800) I could totally be number one.

All the sites I've found are either smaller or don't say how many passwords are in their database.