Which is better from an SEO perspective: a static well-optimized homepage for the primary keyword (say, primary-keyword.com) of a website, or a homepage featuring the latest posts?
Why don't you mix both of them?
Google likes fresh content, so having latest post will make Search Engines to crawl your homepage more often and rank better. If you also have it optimized for your primary keyword/s, you'll have the perfect homepage.
Here's a Seo Moz article explaining the benefits of freshness, which are a bunch of them.
Agree with I.G. Pascual. For an exhaustive list of onsite factors that you should apply to your whole site and not just the homepage see:
for marrying up good keyword research with good user experience see:
Its all about searcher intent =)
For this kind of question, you shouldn't think about this by SEO. It depends on you want to present to your visitors:
- If you want to present a blog, latest articles is a good practice
- If you want to present a web site, a standard web page can be the best solution (even if it won't be often updated)
Think about visitors and not SEO! Google always says if it's good for visitors, it's good for ranking.
And for your domain name, I advise you to choose a brand (if you can) because it is less spammy than "keyword.com".