Nothing puts a grin into my face as when i see a cool app. I was browsing through http://squarefactor.com when i chanced on their square factor story interface. Here is what I generated with some random words! Cool!
I found an interesting sentence generator app at http://sentence.bigparadox.com/. I especially liked their chat application, where you could chat with a bot [robot!]
The work here was commendable, but since the interface was so schoolbookish, i got bored fast, not to mention that I had to scroll horizontally! [I know! What were they thinking? 
] This site reminded me of Google, where the back-end was better than the UI.. [Its reverse with a microsoft app!]
Both these apps are part of a field of study in linguistics called machine Translation.
Machine translation, sometimes referred to by the abbreviation MT, is a sub-field of computational linguistics that investigates the use of computer software to translate text or speech from one natural language to another. At its basic level, MT performs simple substitution of words in one natural language for words in another. Using corpus techniques, more complex translations may be attempted, allowing for better handling of differences in linguistic typology, phrase recognition, and translation of idioms, as well as the isolation of anomalies.
source:wikipedia.org
The above examples serve as fun tools but have broader usage. Some good uses would be obviously language translation using software. Yahoo BabelFish anyone? I used this site and find its okay for basic translation but is not a good tool for absolute translation.