Many of the piece parts that made people use OpenBlocks have since been updated in the form of new single purpose mods. This list includes the Sleeping Bag, Elevator, and Hangglider. There may be other things that were updated as well, but those were the reason OpenBlocks was added to a number of custom packs I've played through 1.7, so I'm glad I can ditch the extra weight of all those things I wasn't planning on using anyway.
Is there a particular functionality from OpenBlocks that you are looking for? Odds are that idea was ported forward somehow in a different, likely standalone, mod.