Calcylator isn’t a big web 2.0 application, but there are area’s where it’ll fit quite nicely with some of the new delivery methods.

AJAX is a technology that differentiates traditional websites with 2.0 ones; the basic idea is that pages are delivered to the user with less page refreshes (thus less bandwidth, in turn quicker !). A good example of a 2.0 site vs a traditional one is maps.google.co.uk vs ebay.co.uk. With ebay you’ll notice every time you update something the page refreshes & the URL changes. If you look at maps.google you’ll notice the URL never changes, in fact if you hit “refresh” on the browser any changes you made to the page disappear.