Originally Posted by: RickBlackerPosts only seem to have a certain amount of time before they no longer appear on the site.

I think you may be looking for the "Display Options" interface at the bottom of any forum that has more than one page of threads.

Notice in the Music Theory forum for example:
http://www.guitartricks.com/forum/forumdisplay.php?f=3

At the bottom of the page under the "Display Options" title are three pull down menus. In "From the" select "Beginning". Then click the button Show Threads.

You will get this:
http://www.guitartricks.com/forum/forumdisplay.php?s=&f=3&page=1&pp=10&sort=title&order=desc&daysprune=-1

Which lists 93 pages of posts! Instead of just the one of most recent posts.

Hope this helps.