Here are a couple of challenges I found on the interwebs:

• SSHliders – from ethicalhacker.net. This one is centered around *nix shell scripting and more advanced topics like pipes.
• Hugi Size Coding Compo #29 (from Hugi) – not much time left there, the deadline is the 28th of October. No flashy prizes either, just the bragging rights that you’ve created something useful in less than 124 bytes (the current leader)

Also, the solution to the Prison Break EH challenge has been posted (on EH.net with additional videos on the radajo blog). There is a lot of cool networking info in there, worth the read!

Have fun!