I think a combination of these ways will work best.

If you want to save your spot in a long thread, then simply right-click on the post number in the upper right-hand corner of the post and bookmark the url which will look something like this: http://www.flyertalk.com/forum/showp...01&postcount=5

Now, when you want to resume reading Who Will Be the Next FlyerTalker to Post (or whatever mind-numbingly long thread you want to review ) you simply open that bookmark. The page that pops up will be just that one post, but here's the magic part: at the top of your browser, you sholuld be able to edit the URL and change the word "showpost" to "showthread", leaving everything else unchanged. So, now you have: http://www.flyertalk.com/forum/showt...01&postcount=5.

If you make that change in your address bar and hit enter, you'll be in the regular thread view, but zoomed right to the post you were looking at. It doesn't matter what your posts per page are or anything else. You can even send someone else the link or post it as I've done here.