I haven't talked a whole lot about web design subjects here, since I thought the niche of focusing on the Notes client was more important, but this is a subject that I might just tackle more in future installments. In the meantime, there are a lot of good resources out there to bring you up to speed on the concept. I'm not really sure if this practice has caught on in the Domino world, or even how prevalent it really is in the broader world of web design, but it's a technique that I've found has a lot of merit.
To get you started, here's a nice little example. It's very simple, but walks you through the process of making a page of unobtrusive script. Check it out and see what you think. I'm interested if it will change the way you approach your code.