A new security release of Joomla 1.5 was published in May 2010: Joomla 1.5.18. An update is highly recommanded.
-> Joomla-Update Recommanded
A good website needs a plan: A fundament for al decisions to be made. Which image shall the domain have? What kind of impression in the users' mind? Which additional components make sense - forum, newsletter, shop, internal area?
If the concept is clear, your site can develop a clear profile - independent of fashion and actual taste. Often it seems if there is not much time for this kind of work. It is so easy to have fast visible results in web. But long-time success needs clear ideas.
Trust our experience. The in concept invested time is saved afterwards: future decisions have a solid fundament and are easier and faster.
Especially if you are planning more than just a contact address in web: Use our techniques and plan some hours to develop a concept.