Mobile Phones -
how do they show your website?
If your web users like surfing with their mobile or iphone, it makes sense to think about that.
Content Management System
Latest news, actual hints, new concerts to announce - if your website is often to be actualized: install a content management system (CMS). But this is not the only argument in favour of this web solution.
Joomla: more posibilities
There are many open source - license free - content management systems.Open source means: the code is visible for the users and can be modificated if there is a need. And a community of developers is continually working on the improvement of the system. A single programmer could not guarrantee this level - and would cost a lot of money.
Joomla is one of the most favoured systems: a big community of web developers continually is working on it. So a successful system like Joomla! does not only provide redactional tools for publishers, but components for newsletters, polls, image galleries, sitemaps, blogs etc..
If there are many functions to realise on your domain, often it is more cost-effective to adapt a CMS to your needs, than find a custom-tailored solution.
Especially multi-lingual sites are easy to realize with Joomla and its components.