Add some more facts about zram and friends.

wiki/src/todo/zram.mdwn

@@ -36,3 +36,9 @@ We should:
   use zram on Debian
 * [Gentoo wiki page about zram](https://wiki.gentoo.org/wiki/Zram)
 * [Google is Enabling zRAM for Chrome OS By Default](http://www.chromestory.com/2013/03/google-enabling-zram-for-chrome-os-by-default/)
+* Linux 3.8 ships a faster lzo compression module, that's used by zram
+  ([commit](https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git/commit/?id=10f6781c8591fe5fe4c8c733131915e5ae057826)).
+* Ubuntu's Live systems have enabled compcache (zram's ancestor) in an
+  initramfs script shipped by casper on systems with no more than
+  512MB of RAM between Intrepid and Precise. Disabled in Quantal since
+  compcache does not exist anymore.