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Is it absolutely necessary? No. However, if you want to prevent the chance of your clients visiting the wrong webpage, it may be a good idea.
get the main ones... .com .co.uk .net. .co and thats about it really, but dont just get .com and leave it, if your business is serious, someone will copy you with a extention with your own domain lol ...register the main ones, its cheap anyways.
Has anyone had to protect their trademark/business name by registering hundreds of domain name extentions which feature your domain name? Currently I have a .com but I have seen sites that offer domain registration for .net .org .co etc.. Is it a good idea to really register all the popular domain extentions? Or is money better spent focusing on improving your current website?