After being impressed with photo.com and Getty Images for royalty free photos, I’ve stumbled on http://www.istockphoto.com/

As Shannon from Macresq says:

Working on a project and need a royalty free stock photo? If you want

quality, but you don’t want to spend a bunch of cash per photo, check out

iStockPhoto.com. Here, you can purchase thousands of photos for just 50

cents each. If you’re a photographer, you can upload your pics and get

paid 10 cents for each download. As a user, just buy “credits” for 50

cents each, in $10 increments. Then you can download to your heart’s

content for a tiny fraction of the price at other Stock Photo sites.

Check it out, I think you’ll like it:

http://www.istockphoto.com/

Nifty, and an example of “why didn’t I think of that?”

If you are doing work on switched circuits, like a trunked phone system, there will be discussion of the probability of end to end blocking and various other traffic quality measurements. Sooner or later Erlangs will be mentioned and it will be handy to know they are the unit of measurement of line use per hour (100% utilisation = 1Erlang).

For an out standing explanation, check out:

http://www.users.cloud9.net/~stark/ctappd.pdf