@runetrek
Welcome to the forums.
In regards to your question, I would estimate that about 70% of our users probably have older, classic Amigas (whether they are using them or not), while the other 30% are divided pretty much equally between using an AmigaOne or a Pegasos. Discount about 5% who're using AROS and I feel that's pretty accurate.
Web stats tell us that only about 9% of the browsers in use on Amiga.org are Amiga browsers, though as the people in denial will point out, a "lot of people" set their browsers (for whatever unknown reason) to spoof Internet Explorer so that they can get into most modern Web sites.
Wayne