Web 2.0 Calendars?

Mike Arrington waxes poetic about 30 Boxes, an entry in the, apparently, red-hot online calendar space. I 'm not sure I get it. It seems to me that working even when off-line , even when away from my computer, would be top requirements for any calendar product. In other words, a downloadable application (Outlook anyone? iCal? Blackberry?) I'd be worried if I could only access my calendar on live web connection. Sure, GMail is hugely popular, and you could make that same argument there. But GMail lets me synch with any POP-client of which there are many. I use GMail with Apple (Mac OS X) Mail when I am at my primary computer, and over the web everywhere else (including my cell phone.) Technorati Tags: mikearrington, calendar