Are we about to witness another dot-com bubble? Last time it all ended in tears, but five years on, could it all be different? We’ll be looking at the new generation of internet start-ups all grouped under the moniker of Web 2.0. We'll be discovering a few common denominators: for a start, they’re all about enabling us to participate and add to the site rather than passively surfing the web. One example is a company that hopes to change the way we use everyday computer applications and another lets you put your photos on line for the whole world to see.