Puppy Linux is a live CD that is easy to remaster, and puplets are remasters with special features. They are different in one or many ways from the standard (official) Puppy.
For example, ttuuxxx has been creating remasters of Puppy with Firefox since Puppy version 4.2, and he calls his puplet "Puppies". Pizzasgood has recently created a 4.2.1 multiuser puplet. Puppy can also be run in Virtual Machine in Windows (1 GB RAM required!) - see playdayz' VirtualBox puplet. A much-appreciated puplet series is the NOP/XFCE series by Gray.
Puplets are special-purpose, so for further example, ttuuxxx has also built 2.14X, a puplet with updated libs and applications (but old kernel 2.6.18). This is suitable for pre-dual-processor PCs - it will work well with the original eeePCs. And speaking of the eeePC 701, Raffy (me) has released Breeezy, a 65-MB puplet in ZIP form ready to be installed to USB or SD flash. Breeezy is now getting old, but it is still useful for the original eeePC 701 4G and 2G Surf.
You can now see that the challenge in puplet sharing is in support. Ttuuxxx's "Puppies" puplets are released shortly after the official releases (since Puppy 4.2), so support of "Puppies" is easy through the Forum. Other puplets have their own Forum discussion threads, so it is just a matter of searching for that thread and reading it to check if your problem is already answered. For other, less popular puplets, you have to visit the author's website or email him/her to get support.
With so many puplets being shared, it is too time-consuming to keep track of all of them. Here are sites that discuss or store puplets.