Some time ago (about 12 months) I created a number of targeted pages for our main product site. Out main product can be called several different things and clearly it's not possible to optimize our home page for all of them so we created new pages called 'secondary-term-1.htm' and 'secondary-term-2.htm'. These contained unique content and at the time I linked to them our site map and our blog. And that was it.
A year later these pages are now ranking quite well and I want to expand on this concept and create new landing pages for other terms. I believe these landing pages are useful to people searching using different terms and relating this back to our product. I also think they are useful in explaining how our product is useful to different market segments.
What is the current thinking with respect to Google as far as these landing pages go? Are we likely to be penalized in some way? This site is our main money maker and I am ultra cautious with what we can and cannot do on it.