Ok so you want to do some DHTL and AJAX, and you really love the look of windows 98! Well the first place I would recomend you go is BINDOWS.NET. One of the guys at work pointed me to it last week. It has all the ushall components that we flash/flexers have come to enjoy including the Accordion pane and group box. It even has an app laucher similar to that found on Macromedia.com for the flex components.
http://bindows.net/bindows/samples/applauncher/

The best thing about this famework is its xml driven. Yes that right its a javascript version of flex. you create your page in xml to describeyour layout and insert any specifc javascript in the xml, parse it with xsl and bam you have your windows 98 application running using SOAP, webservices, of any dynamically loaded data. Wonder if there is an ide for development? Be warned though this framework isnt free……..or cheap. But as with most of these things it was cost 20 times that to develope yourself. So basically you can go about building a replication of your windows form application on line using AJAX for data transfer.

Which brings me to my next cool site to check out. I stumbled upon this one when looking through my blog refers. It hits close to home And I really love the idea as its something which I started (and subsequently have let gather a few cobwebs) a while ago. An operating system made in flash. Check out
http://adrien.beraud.org/flashosClient/5/flashos.html . Its pretty cool but im a little unsure what some of the features are as I cant read french. The mouse cursor is interesting too! The best thing it has flavours of OSX and windows