Kate --
It may take some time, but it looks like you can e-mail each blog post to yourself (see Email Post command at the bottom of each posting).
Or (this is easier): Open the topic so that your first posting is at the top, then go to the Topic Options tab and choose "Print Topic." That opens a new printable page. From there you can (a) print it or (b) go to Edit/Select All (in the commmands at the top), then copy and paste the highlighted text into an e-mail or into a Word document.
-- Leslie