Samtec has a pretty wide range of small headers. 0.050" pitch is a standard size. They probably go smaller as well.

A few examples:


male headers
surface mount sockets


Standard small header size
While reading a PPT on BFS (Breadth First Searching) I found that BFS can be used where we have " pointer-chasing" . What exactly is a pointer chasing and how is it related to BFS? 
