Today Is...National Writing Day

There is a saying in Iceland 'Everyone has a book in their stomach' and as every tenth Icelander is a published author, it is probably true for them but almost everybody i know has at some time considered, or have started, a novel.
I have a folder on my desktop titled 'story ideas' and inside it is a notepad file that contains paragraphs of story ideas that i plan to get around to writing one day but find the idea of actually writing them too daunting to begin.I had a go once but my novel quickly became a novella and then a short story and then a forgotten couple of Word documents on a floppy disk which has long been recycled into milk cartons by now.
What i need is to hand the ideas to someone and they do the 12 months of writing and editing and proof reading but i still get the royalty cheques and get to turn up at the Man Booker award ceremony to thank my agent and give no thanks whatsoever to God who wouldn't have helped me in any way.  
What would be nice is for some software genius to write a program where you fill in a few prompts and it that writes the story for you but as yet that hasn't hit the shelves of PC World but science has found the secrets of how to write a best selling novel.
Scientists have developed an algorithm called statistical stylometry which can analyse a book and predict with 84% accuracy whether or not it will be a success.
A group of computer scientists from Stony Brook University in New York said that a range of factors determine whether or not a book will enjoy success, including interestingness, novelty, style of writing, and how engaging the storyline is.  
They analysed over 800 classic books and found that several trends were often found in the most successful books, including heavy use of conjunctions such as 'and' and 'but' and a large numbers of nouns and adjectives.
Less successful work tended to include more verbs and adverbs and made heavy use of words such as 'wanted', 'took' and 'promised'.
Sounds easy but if you have a potential novel with a storyline concerning a person who wants to take peoples promise's you may want to rethink it but if  you did clear the decks to have a shot at writing a novel, whats the best genre to write?
The Harris Interactive report shows that out of every 10 books sold, 8 are fiction and of these 48% were Mystery, Thriller and Crime novels with the next popular genres being Science Fiction (28%) and Romance (21%).   
So there you are sat with a blank Word document and the cursor blinking at you and have a great idea to hit all the bases for what people like to read with a Romantic Crime Thriller set on the International Space Station but how long should it be?
Some of the greatest books ever written were not long books by any stretch. George Orwell’s Animal Farm is only 30,000 words, A Christmas Carol is under 29,000, The Great Gatsby 47,094, Of Mice and Men has 29,160 words, William Golding considered Lord of the Flies complete after 59,900 words and The War of the Worlds by HG Wells is only around 61,500 words long.
Please note that if you have the idea for a romantic crime novel based on the International Space Station, it's already gone.