Mmmmmm.....
An interesting question for both veterans of the phenomenon and newcomers (like myself!) alike.
Why have I decided to take the plunge 
The answer: by complete accident!
I'll be completely honest, I had never even heard the term 'blog' or anything connected with it before Friday night. Now, here I am. Joining what seems like the many others in the last couple of days.
Picture Friday night infront of the laptop, randomly searching 'Google' (always good entertainment when not looking for anything specific!) One press of the 'return' key and the word 'blog' sticks out like a sore thumb. I was intrigued and found myself browsing blog after blog in search of a better understanding of what they were all about.
My search took me to many different blogs and in my search I had the pleasure of reading delights created by the likes of jakeandsarah (for the entries of a couple very much in love), stroke (for the entertainment factor), juzzzy (post entited 'A Bad Time To Talk' is legendary!) and beforeuaskimnotblond (for honesty and strength). But then I'm sure that none of those listed will come of any surprise to you!!
It would seem that motivations for 'blogging' differ from one person to another: To document your life, become part of a unique community, to give opinions, to practice writing skills, for amusement, to express feelings not able to in another forum...the list goes on and on!!! I'm still not sure what my motivations are (but boy have I thought about it in detail!) but I can say that I felt an URGE to have a go and see what becomes of it !! Aren't I brave eh?!!
I am obsessed already - I spent FOREVER getting the thing to look the way I wanted to - much to the annoyance of my good man!! First impressions still count for something don't they?!! Well, my hope is that MY motivations become clear as my blog develops. In the meantime, I will enjoy having a project to nurture 
I would appreciate your thoughts on the matter - WHY BLOG?!!
With love,
M