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has posted up a 5 page article which will help you create some decent maps for Doom 3. Each page covers different topics of making a map. This will be a really good article to check out if you are looking to get into map making. Here's a snippet from this article:
[quote]It is fortunate that DOOMEdit is similarly styled to Radiant because there is already a plethora of information available and a lot of it applies to DOOM editing. There are, however, many differences â€“ some subtle and some not so subtle. Where applicable I will try to focus on the differences between Quake engine and DOOM engine editing, which should prove somewhat useful to those of you who have tinkered around with Radiant in the past. Because there is already a wealth of information regarding Radiant, should you encounter a problem that isnâ€™t covered within this guide the answer you seek may well be contained in one or more of the many Radiant editing guides that already exist. Check out the links and resources section for a directory to useful forums and guides that are available. The glossary of terms on the Radiant website may also prove useful to you. [/quote]
Head to Viavga
to check out more.