SEO Question Regarding "Last Post" Links and NoFollow

Hi, all...

If it helps to have this information, I have the URL Rewriting Mod installed on my site and it is working well.  I have also installed the site map plugin and submitted a site map to google and yahoo (The sitemap uses the rewritten URLS - I don't remember if it worked that way out of the box or I tweaked it to do so).

My ultimate long-term goal is to have search engines index only:

Links to Forums
Links to Topics only using the main topic link (not any "Last Post" or "View New" links) to get there.

That's going to take a lot of modification though.  The main pressing problem that I want to take care of right away is (because they are on the front page) Search Engines picking up the "Last Post" links and indexing those as the main links to topics.  As a result, when users find my links in Google  they are being taken to...

http://www.mysite.com/p1234-03-07-2008-11%3A19%3A12.html#p1234

...which is a specific post in a thread rather than...

http://www.mysite.com/t-1234-Name-of-Thread.html

...which is the main (and correct for SEO purposes) link to the topic.

All of this is a very long way to ask about using rel="nofollow" in the "Last Post" links on the front page and forum pages.

I **think** the way it will work is to not let Google see that the "Last Post" links are a way to get into the topic, forcing Google to drill down from the front page to the Forum pages and then to the individual topics.

Does anyone have any idea if this is the correct way nofollow will work.  I don't want to cut off access to the topics all together.  I just want to cut off the "Last Post" links as a way of search engines getting there.