i've written a few abstractions and i've decided to upload some of them (most of my useful ones are here). i use pd-extended and i haven't tested whether they'll work on vanilla pd.
there are a lot of small but handy abstractions in this package as well as some more complex sequencers.
i've also included introduction patches which give a quick explanation of almost all the abstractions included.
out of the "small but handy" abstractions i find [map] the most useful.
some of these are really messy, some aren't well-documented, some may have bugs, and some were pretty much ripped off from other people (i've tried to give credit though).
also, there may be a few abstractions you'll want to edit because i have some of my path-names in them. i think [snd~] and the sequencers have them. your best bet is to open them in a text-editor and search for "/home/modula" (without quotes) and replace the directory with whereever you store your sound files or data, respectively.
anyway, hope you enjoy these, and if you have any questions, feel free to reply and i'll elaborate as much as possible.
Edit: i'm now maintaining these on github. the latest versions of them will always be here.