As it says on the tin, it adds lots of really needed usage between some mods and NEI. Like the bee species and serums in NEI. NEI [?] usage to populate the AE pattern encoder. Just all around awesomeness that we need badly. http://www.minecraftforum.net/topic/1803460-147151152-nei-addons-v17-with-forestry-2260-support/
I'm using that mod too and I really love it. It's a really useful and neat addon for NEI that makes life easier. I would love to see that addon on SKCraft.