What does this do exactly?

Add Thread Titles

Add Thread Titles to Showthread Links Anchor Text? NEW!
Enable this option to create keyword-rich links by adding thread titles to URLs that point to showthread pages.

NOTE: This option works ONLY with vBulletin 3.5.x

Add Thread Title Options:

Do NOT add thread titles
Keep vB's original functionality. Links posted in threads/posts are not modified.

ADD thread titles as "popup text"
This option adds the target thread title to the 'title' (popup) tag of every link that points to a showthread page.

ADD thread titles as "original-text (thread title)"
This is a combination of options 1 and 2 (above). The original link (text) is left untouched while the 'thread title' is added (within parenthesis) right after it.

REPLACE original anchor text
This option replaces any link pointing to a showthread page with the corresponding thread title.

*Links pointing to private forums are NOT replaced to prevent privacy issues (i.e. people determining titles of private forum threads by writing random 'showthread.php?t=xxxx' in postings)


Add Thread Titles to Showpost Links Anchor Text? NEW!
Same link replacements as above but for showpost URLs.

Is this like the external thing where it retrieves thread titles? For URL's on our forum? What's the reccomended setting?

And it says 3.5.x only.. but I have the external thread title enabled and it works fine, even though it says the same thing?

Is this like the external thing where it retrieves thread titles? For URL's on our forum? What's the reccomended setting?

This function allows to add the thread title as anchor text for the local showthread links (on-the-fly).

And it says 3.5.x only..

It means 3.5.x or greater

I'm not quite sure I follow, can you give me an example with it on and off?

Post a link to another thread on your site. It will change the link text into the title of that thread. Turn it off, and it won't.

Ah hah!

Thanks.