Since the 5.1 update (which added back the 'type' filters lost when Collections first showed up on Kindle 2: All/Books/Periodicals/Docs/Active Content) I've completely stopped using Collections (except for one to store Kindle Owner Lending Library book samples which functions as a KOLL 'wish list'). I've got hundreds of items, and it is easy to find any them by setting the appropriate filter and using the Go To feature (tap the 'n of m' label). Much easier than spending time navigating and maintaining collections IMO. I sort by Most Recent and the Home page always shows the content I'm actively reading, so usually just pressing Home gets me to the next thing I want to read right away. YMMV of course.
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