AutoDesk (The company mainly known for
AutoCAD,
3ds Max, and
Maya) made a web based application strictly for architecture, and it's called
HomeStyler, now it's pretty nice, and powerful, however you must have Flash installed in order to use this, cause it is a flash based web application, however this is a great way for users to get started/introduced to architecture using AutoDesk's new web application
HomeStyler.
(Seeing as how I found this about 2 or 3 weeks ago, and finally have a few minutes to spare online, so I thought I'd share this with you guys)