Over at SmallBizServer.net a new article has been published on how to publish a Microsoft Project Server portal through ISA 2004. You can read the article here.
Many of the articles from SmallBizServer.net require a subscription. This one doesn't seem to, so get it while it's available. My only comment is that in Step 1 under ISA, it says Create a New Rule. Since we have 3 types of rules to choose from in ISA, this really ought to read Create a New Web Publishing rule.
They are doing some great work over at SmallBizServer.net so if you aren't familar with them it would be a good idea to check out the entire site.