Thanks for the article.  TMPFS is a really great tool, and deserves more attention.  Something that your article could be a little clearer on are the advantages of TMPFS over the traditional RAM disks that many of your readers may already be familiar with:

1) A TMPFS system only uses RAM as needed.  The 2GB figure for the  /dev/shm example in the article is just the maximum, it usually uses no memory at all.

2) Infrequently used content in a TMPFS system can be swapped out if the system is under memory pressure.