Are CDNs for JavaScript libraries a good idea?

I was reading Ajaxian and I see that Google has launched what seems to be a CDN (content delivery network) for JavaScript libraries, in particular the following libraries are currently supported:

• jQuery
  
• prototype
  
• script.aculo.us
  
• MooTools
  
• dojo

The discussion over at Ajaxian has it's share of folks in favor as well as detractors and I understand the potential issues where you'd now be dependent on Google's goodwill and server uptime for your site to function properly, but that you could get a potential speed boost as well some caching benefits as well. I knew that dojo was available via a CDN from AOL already, so it seems at first to be a good idea to "prime the pump" of user browser caches, but I'm wondering if this is really it's cracked up to be.

The Google Ajax API entry specifically calls out speed as a benefit of this service, but the Google Ajax Libraries API doesn't list any real world, or theoretical usage stats. I'm sure Google's data centers are plenty fast, but if anyone has done any testing to back this up, I'd really like to see it so we all can see the potential in this. And if it is a Good Idea™ then I'm wondering if Adobe's Spry should jump on that bandwagon too.

So if you have any thoughts on JavaScript libraries, especially any testing done with CDNs, it would be good to hear from you. Comment away!

Starting out on the curve

I've been involved with Dreamweaver since I got a copy of Dreamweaver 1.2 ( for free on a CD that came with a British technology magazine that I don't recall the name of). I think that Dreamweaver 3 was about to come out or that it was just out and the 1.2 freebie was the incentive was to get 3 with an upgrade price. I was immediately struck with how lacking my then svelte Notepad-Netscape 3 driven development seemed so lacking. :-)

From there thinking back a bit, it seems that the learning curve really hasn't flattened out.

After getting Dreamweaver 4 and Fireworks 4 studio I really started looking more at the way that Dreamweaver was truly built to be extended and I rooted around in the configuration folder and learned a ton. I struck up some friendships on the Dreamweaver forums and on the recommendation of Angela Buraglia I volunteered and was accepted to join Team Macromedia for Dreamweaver in early 2002 or so (has it been that long already?). With the Adobe purchase of Macromedia a couple of years ago I became part of the Adobe Community Experts with my primary focus still being Dreamweaver. Along the way I've written a number of articles and tutorials at CommunityMX a great resource site for all things Adobe, contributed a chapter to a book and have been the technical editor for quite a few Macromedia and now Adobe product related books.

I'm working at WebAssist (3 years June 1st this year, time files) where I mainly build extensions for Dreamweaver using the fantastic extensibility layer as well as coding ASP (JavaScript & VBScript), ColdFusion and PHP.

But as with all things, nothing stays the same; so I'm always looking for something to learn to stay on the up good side of the curve (notice a trend here? I'm parenthetical)(he says parenthetically). I've been doing a good bit of playing around and reading up on JavaScript libraries including Adobe's Spry, Script.aculo.us jQuery, and MooTools among many many others and how they can be used to enhance the user experience. When WebAssist had their latest redesign I helped put in some Moo.fx flavored actions. Intriguing also are content replacement/enhancements such a sIFR, swfIR and SoundManager. I've also been thinking a bit about the possibilities that Adobe AIR (and by extension Flex) offers to web developers like me by bringing the technologies I know to the desktop.

I hope to be able to keep on learning new and interesting technologies as well as learn about new ideas and trends, both in the realm of the technology I work with and the greater world at large. So join me and I'll join you in this fantastic learn experience that is life.

Well I guess that's enough linking around, so I'll sign off this initial post.