Hi Paul, yes I do know Typepad. In fact our marketing blog, the first one we did is on Typepad. When we first started getting into blogging, we read the small book Blog Wild and he suggested Typepad.
In hindsight, it would have been great doing it in WP, but making the transfer, risk of losing RSS subscribers, etc, have put that thought on hold.
So Typepad, unlike WP, they do not have a free version. You will pay a minimum of $4.95 per month. It does have a wide variety of widgets and a choice of themes, but certainly not as much as WP does if you host you through your own server.
Also, customization of the blog is more limited, but they do have a very intuitive backend as far as setting font size, color, creating menus, etc. But again, you just don't find the variety of features as in WP. In fact, several times Judy or I have seen a great feature on a blog, only to find we cannot use it on our Typepad blog.
I know that several of the bigtime bloggers use Typepad, including Seth Godin.
I could go on and on, but DM me if you have any other questions about Typepad. Still my vote is for WP!