dictionary.com

Advantages: Ease of use, comprehensive, able to look up the impossible words you've been given to write a story with
Disadvantages: Not many

...as a link to the Dictionary.com store, just in case you love the site so much that you want to walk around in a dictionary.com hat! (I know I'd take the p**s out of anyone wearing one of these - so you've been warned!). As far as the book recommendations go, in addition to title and author info, there is also a short description of each book, but all in all the bookstore section isn't really great as there's not a lot of content. -Fun & Games- ...
...at first, until you realise that most of the content is restricted to those who sign up for premium membership of the site (currently $12.95 per year). The things that you can access are a crossword for the day and also a word search. If you shell out for the Premium Membership you can also get other games as well as a thirty day games archive. The funiest one, judging solely from the title as I'm a poor student and can't afford such luxuries as ... Read review

Advantages: Free and easy to use
Disadvantages: Any ideas

Dictionary.com a US based company I think; at least you can contact them in the USA. After typing in the web address you are presented with a simple front page. Not too much colour or detail, it downloads easily. There is a member’s login facility (yet be explored - check out future updates) in the right hand top corner. Centre align a simple search engine to type your query you can specify Dictionary, Thesaurus or Web for a more specific search. ...
...spits into 2 section either dictionary.com or reference.com. Dictionary.com offers an online bookstore with some amazing reductions from Amazon.com, Tools, Translator, Fun and Games, other dictionaries (legal, medical etc). Reference.com offers an almanac, atlas, dictionary, encyclopaedia, legal, legal, literature, medical, thesaurus. They also offer the facility to put a specialised search engine on your website. This is becoming increasingly ... Read review

Advantages: Free, fast, quick and easy
Disadvantages: None

Dictionary.com allows you to look up words in several on line dictionaries at once. When the search is complete all results will be displayed from the various on line dictionaries in its database, and you can then read each of the results to find the meaning of the word you're trying to spell. Because the dictionary also searches some specific dictionaries, such as medical dictionaries, it will find a wide range of meaning for a wide range of words. ...
...suggested words will be shown, similar to the way in which a spelling checker works in a program like MS Office. Dictionary.com also has a few extra features such as word of the day, which displays a word each day which is unlikely to be in your everyday vocabulary. ... Read review