Importing non-blog entries into WordPress

Hope one of the experienced WordPress folks can share some thoughts on how to do this.

We have a part of our high traffic website that is reserved for interesting links that we share with our users. This has the following sections:

1. URL
2. Title
3. Description
4. Mood (Happy, Sad, etc)
5. Date

You can see this in action here:
http://snipurl.com/interesting

I guess most of these fields are addressable in equivalents in WP. The “Moods” can be tags or categories.

Our issue is that we have used our own homegrown CMS (very basic, of course) to enter this data over the years, but now would like to port this to WP.

Instead of inputting these URLs one by one, we would like to automate this in an import script.

Question: What tables and fields should we import our values in? Is there any how-to that we can read on the best way to do this? I read the Codex page about importing, but it seems to have information about importing from other blogging systems.

Thanks!