B-Trees:
	Diagrams
	B+ tree
	I don't want to draw all the diagrams this time
		Slides! (balance.pdf)

ReiserFS:  The B-tree revolution
	- Everything goes in the tree!
	- Journaling
	- Online resizing
	- Tail packing (can hurt performance)
	- Big kernel lock

The nature of data:  Structures, strings, and arrays
	Can we make ourselves a linked data structure with just offsets?
		Yes, might take longer than we want to devote to the purpose.
		Keep free spaces in a heap or something
		Space and speed are often at odds with each other
	mmap:
		mmap demo from olden days (253 might have seen it)