Instructions for installing new templates into Joomla! How to install templates – Joomla! Documentation
Places to get Joomla 1.5 templates
Artisteer is template generator for around $150
Simple Machines Forum — SMF in short — is a free, professional grade software package that allows you to set up your own online community within minutes.
Home of SMF: Free PHP and MySQL forum software
The community forum for SMF is a good source for information on this software.
If you are shopping around for content management software a good resource is The CMS Matrix at cmsmatrix.org. See The CMS Matrix – cmsmatrix.org – The Content Management Comparison Tool
Where to get Windows Live Writer
Blog your heart out
Writer makes it easy to share your photos and videos on almost any blog service—Windows Live, WordPress, Blogger, LiveJournal, TypePad, and many more.
See Download Page for Windows Live Writer