I was familiarizing myself with some of the hidden files in OS X (while cleaning house) and I came across a hidden folder inside the /Users/Shared directory. It's name is "." followed by a 32-character hex string, which (I googled the string) is the MD5-encrypted version of the name of my user account on this computer.
The folder was created in 2008, but last modified just two days ago (which leads me to believe it's been accessed somewhat regularly). It contains three files: "." (4 KB document, created and modified two days ago), ".." (Zero KB document, created and modified in 2008), and "Temporary Items" (4 KB document, created and modified two days ago).
Is this normal, or is something strange going on? (Have I been hacked?) I'm using a PowerPC Mac running 10.4.11 (yeah, I know).