WhatIs.com
WhatIs.com, the holy grail of tech terms, does a fantastic job of teaching you all about the latest tech terms. For example, go to the definitions section to learn the difference between ASAP, ASP, and ATS. You can also learn about every file format in the world, the different types of speeds used over the Internet, where to find free tutorials and training, and more. For an overall great reference, this is where you want to be.

Webopedia
Webopedia has a fantastic dictionary full of all the tech jargon you need, want, or care about. The site is simple to navigate with its open search function front and center. Enter a word by itself or choose from a category of words that take you to a list filled with lingo from your point of interest.

Visit Webopedia daily for its current section of information where you'll find the word of the day (which you can also have emailed to you), the 15 most-searched-for terms, and an area to look for a job now that you know so much about tech. Make sure you check out the "recently added" section, which includes the latest and greatest words on the street.

Dictionary.com
Dictionary.com offers all the whistles and bells of an old-fashioned dictionary. It also contains all the tech terms you need to know. Patrick Norton loves Dictionary.com, which is enough reason for me to use it.

HyperDictionary.com
If Dictionary.com takes too long for you, surf to HyperDictionary.com. I often use this quick, easy-to-use replacement to search for what I need. It has a few dictionaries you can jump to immediately including the English Dictionary, Computer Dictionary, and Medical Dictionary. It also offers a thesaurus so you can find the perfect word in seconds. HyperDictionary.com can even help you interpret your dreams. Just click the Dream Dictionary and search for a word related to what you want interpreted.

Wikipedia
Wikipedia's contributed content grows exponentially with community participation. As with a standard encyclopedia, you can search categories such as science, arts, and math as well as a plethora of subcategories. The publishers and users trust what you write, so don't try anything silly. Submitting false information gets you ostracized.