Edgadget halloween contest, ends on November 1st (Wednesday).

Dress up like the consumer electronics devices, mascots, etc. and send your picture to contest@engadget.com with Halloween in subject. Best costume wins the prize.
You get points for creativity, complexity, and, to a certain extent, obscurity. Check out last year winners.

Rules:
-You can enter this contest as many times as you like, but you can win only once.

-Contest is for US only.

Prizes:

-1st place gets a VidaBox SLIM Windows Media Center PC (Worth $2,200)
-2nd place gets an unlocked Motorola PEBL
-3rd place gets an HP Photosmart E317

More details here

You have another chance to win amazing prize: Philips 42PF9631D 42-inch plasma! Contest ends on 17th October (Tuesday)
To enter the contest you will just have to leave a comment on engadget.com telling them whether or not you already have CableCARD. Winner will be picked at random.

Rules:

-You may enter this contest only once and win only one prize (in case you entered other engadget contests).

-It’s for US ony.

enter the contest

Engadget contest, ends on the 16th October.

You will have to count the number of Zune stories Engadged did in the September — excluding contests, podcasts and posts that just mention the Zune. When you’re done, send the answer to inecontest@engadget.com.

Rules: You may only enter this contest once and it’s for US only.

more informations

Another engadget contest. It ends on 18th October. This time the prize is 250$ worth Slingbox Pro.
Winner will be random person who leaves a comment telling them what kind of phone (or laptop) is he planning on using this thing with.

Rules:
You may enter other Engadget contests, however you may only enter this contest once
You can only win one prize.
You must be US resident to enter.

enter

You’ll have time until 19th October to enter this contest; they’ll pick somebody at random who tells them in the comments which accessories they plan to buy for their 360 (or have already bought for their 360 if they already have one).

Prize is Xbox 360 Premium Bundle which contain:

* Xbox 360 console
* 20GB drive add-on
* Wireless controller
* Xbox headset
* Component high def AV cable
* Ethernet cable

Contest is open to everybody worldwide!

LINK

Competition started on February 1st, 2006 and ends December 31, 2006
It is usual SEO Contest, where the main objective is to find the best SEO expert on the Internet.
The website which will get the #1 ranking in major search engines for ‘carcasherdotcom seocontest’ term will win the contest.

-First prize - #1 in Google, $3,000 + 42” Plasma TV + $12,000 SEO Contract for 2007
-Second prize - #1 in Yahoo!, $2,000 + Sony PSP
-Third prize - #1 in MSN, $1,000 + Apple iPod
There is also total of 800$ given away each month to 3 best ranking websites.
Dirty Seo techniques aren’t allowed
More informations here.

Contest started in 14 July 2006 and will end at October 20 (you can still join, but your have less chances to win).
This is World Championship in SEO (search engine optimization). It is a great online contest for all SEO beginners and experts. Not only It can prove your SEO ability, but also give you a chance to win valuable awards. For beginners, it is a good opportunity to learn the best strategies from the live SEO event.

How to win?
You will have to optimize your website to get the highest ranking in Google for the keyword provided by organizators.

1st Prize - US$4,000, 2nd Prize – US$2,000, 3rd Prize – US$500

Link