Found this via Ajaxian, it’s a nice calendar widget that lets you click and drag ranges in calendars. Check it out:
Timeframe, by Stephen Celis

Adam turned me on to SPL, here’s a good write-up. Essentially, SPL is a MUCH better way to deal with OOP in PHP 5 through faster, more seamless interactions with the actual PHP engine.
Zend DevZone: The Standard PHP Library

As always, another great article from A List Apart… this time on data visualizaton. Check it out:
Accessible Data Visualization with Web Standards

Nothing’s cooler than writing a bad-ass site or application and watching it gain popularity and a significant user base. By the same token, nothing’s more frustrating than watching your app fall on its face when its running under high load. If you’re like me, you know how disheartening this can be, as it usually means that its time for a hard dose of reality: your code probably isn’t as awesome as you thought it was.

Or is it? There’s a whole slew of things that a person could point a finger at regarding slowly running code. The most-oft thing that gets called out is code with a lot of overhead (a ton of includes, excessive logic, and the like), and right behind that is poorly designed databases (unoptimized indexes, no indexes, ridiculous amounts of joins, blah, blah, blah). Well, let’s assume for a minute that you’ve got a fair amount of experience under your belt, so you know your code is pretty damn optimal, and you also have a DBA buddy that took a look at your database and helped you tweak it up a bit. What do you do if this isn’t enough? Before you say, “throw more / better hardware at that mo-fo”, why not take a moment and learn about APC: Alternative PHP Cache…
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If you haven’t been using the Firefox 3 Betas yet, now’s a good time to start! This latest release brings major speed improvements to the JavaScript engine, along with some other goodness. Full release notes here:
Firefox 3 Beta 5