Great mobile Web sites keep popping up! The latest one to come onto my radar is Zipiko. It's a great little "social utility" that allows you to quickly organize ad-hoc meet-ups (the mobile Web equivalent of "let's do lunch") to more involved events. The idea is simple - you visit a mobile web site at http://zipiko.com, register if you're a first time user, then set up an event (you input what, when and where - like "meet for a coffee, 2:00, at Joe's Diner." Then you plug in your friends' mobile phone numbers to invite them. They all get a text message inviting them to the event and asking them to respond by text if they accept the invite. Everyone gets a reminder closer to the time to keep you on track. And the next time you want to set up an event, all your friends' details are saved so it's even easier. That's it! The simple user interfaces works across multiple types of phone browser from the simplest flip phone to smart phone browsers. It's a great example of using the mobile Web to do something you couldn't really do with the PC-based Web.