The “User Agent” string is a part of every request to a web server that tells it what type of agent (browser, spider, etc) is requesting the content. There are some sites that will give you different content depending on the user agent string. Some common ‘User Agents are’ :
Browser User Agents

Firefox (WindowsXP) – Mozilla/5.0 [...]

10 heart-thumping, hair-raising, adrenalin-pumping experiences you wouldn’t want to miss. And you can win them for just Rs.1* each.
#Bid on one/more experiences #Track the bidding action and raise your bid
ebay.in has come up with a new auction – 10 things to do before you die. It starts with “Co-pilot a L39 Combat Air [...]

Taken from the php-general mailing list. [ Mail by Rasmus on AJAX ]

Todd Farmer of West Chester, PA, sold his AOL 1.0 startup disc for over $9,000 in an online ebay auction this week.

Mr. Farmer explains, “that disc served me well. It’s a 5 1/2″ floppy, double-sided, double-density with all the original packaging. This bad boy wasn’t free for me or anybody back then, so I wasn’t [...]

Jeffery Vaska has “10 Tips That Every PHP Newbie Should Know“, a nice collection of tips for a newbie venturing into PHP. Tips like MySQL Connection Class, Dealing with Magic Quotes etc can be found there.

This Wraparound Gaming Monitor by Alienware was a prototype displayed at CES 2008 expo. It supports a max Res of 2880×900. This sample appears bleak and washed out. However, the commercial models which will be out later would hopefully live upto the gamer’s dream.