I have a new site about 1.5 months old, consisting of about 300 pages. Google ate it up, and and all pages are indexed and I'm getting nice traffic from them.

Yahoo SLURP comes by daily but nothing was indexed. 2 weeks ago, Yahoo indexed 4 pages. When you do a site:domain.com on yahoo, it shows 3 pages listed with just a url to one of my pages on the site.

The number 1 listing however, is the homepage and has the url for the homepage. However, the homepage is not hyperlinked so you can't click it from yahoo to get to my homepage.

Is this some kind of a penalty?

I do not understand what you are tyring to say? Is this still relevant? Or have you figured out your dilema.