I recently stumbled across Indochino.com while reading my favourite daily newspaper and I really got interested. Indochino, the brain child of two Canadian students (or rather former students), is a company that sells custom made suits and shirts online. You input your measurements following some pretty detailed videos and order your suit. Prices are great (around 250€ or 350$) and they ship worldwide, within 2 weeks. If your suit doesn't fit, they pay for your local tailor to fix it (up to 55€ or 75$), or you can apply for a free remake - or you consider the suit worthless and you get your money back.
Information and reviews about Indochino are spread all around the web. I will try to gather the most up-to-date and most relevant information here, post links to forums and write my own insights about Indochino (I have recently ordered my first suit from them). If you have any suggestions, comments, etc - please let me know :)