I found it quite useful when I found out you could do this, even if it is so simple.  Unsure how well known it is, but makes the creation of cycles MUCH easier.

Hope to make the tutorial thing a more frequent occurrence, but with hopefully less stuttering. :P  If you have ideas for a tutorial, please let me know and I will either point you in the right direction or make a video.

My DeviantArt:
http://argodaemon.deviantart.com/

My Twitter:
https://twitter.com/argodaemon

Other places for good SFM Tutorials:
http://www.youtube.com/user/SourceFilmMaker
http://www.youtube.com/user/Ronaldthecock

If you have other channels to add to the list, let me know!

Background Music:
"Cipher" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
http://creativecommons.org/licenses/by/3.0/