Here are three ways you can save time when you install WordPress blogs frequently. The biggest time-saver comes at the end.
So make sure your web host offers Cpanel with Fantasico.
The second way to speed up the installation process is to create a template of your WordPress blog or web site. Decide which plugins and which theme serves your best. Then optimize the configuration of your blog, making it just the way you would like to have it on multiple sites.
You can always make minor color changes to your blog, but knowing the base configuration, the right plugins and fitting it with a good standard theme, can save you plenty of time when you go to install the blog again at another location.
Once you have optimized your WordPress configuration and settings, you should install a plugin called Backup Creator. Backup Creator lets you instantly make backups of your WordPress blogs and web sites. Even better, it gives you the power to clone your WordPress installations and eliminate the need to go through a tedious process of setting up your site each time.
Right now the first 5GB of Amazon S3 is free, so this becomes an awesome feature in Backup Creator.
And not only that, but you can now automate your backups with a set-it-and-forget-it one time configuration on Backup Creator.
By the way, Backup Creator is currently protecting over 25,000 sites, so it has become a very popular plugin, which I use on all of my sites and has personally saved me a ton of time.
Hopefully these tips help you save time and become more productive when installing your WordPress web sites.