I don't think you can ever have really enough drump loops. While I'm mostly not into purely loop based music production , I do find that putting a few loops together as a starting point can really ignite the creative process. It is important to keep your loops collection fresh though. Auditioning the same old stuff over and over again really isn't much fun. That's where Drums on Demand's (DOD) Downlodables come in.
Downloadables are song packs that contain a bunch of loops that are availble for direct download from the DOD Yahoo! Store. All the packs are avaible in several formats: Wave, REX, and Apple Loops. As of now there are several sets availble in two genres: Reggea Jammin' and Organic Session.
Reggae Jammin'
These sets offer "six super-deep Song Sets inspired
by some of the best-selling reggae grooves of all-time. The traditional
sound and mix feature higher-pitched snare, toms as well as a drier
overall mix." Each song set contains about 60 loops and costs $6.95. You can also download single hits to feed your sound-hungry sampler for $ 6.95.
Organic Sessions
Organic Sessions offer something slightly out of the the ordinary. Organic natural sounds which are less punchy but ideally suited for "acoustic and harmonically rich productions." There are 4 song sets available and each costs $4.95.
I think these are pretty neat and they offer instant gratification. Very important if you just want to get going and not wait for your order to arrive.