I like the way the Clark zipper works - both sides of the hammock can be entered/exited via zipper entry. It is one long continuous zipper with 2 pulls that meet in the middle. Both ends are on the same "end" of the hammock. When the bugnet is zipped back, it can be stuffed in a pocket at the end of the hammock. Love that setup.
owfinc.com - great place for coil zippers, and very helpful.