Download the zip file and unzip the UniTweets folder into the plugins directory of your WordPress installation.
Next, log in to your WordPress admin and go to the 'Plugins" section. Click 'activate' under 'UniTweets'.
Finally, under 'Settings' click on 'UniTweets' to be taken to the UniTweets options panel. Here you can configure which accounts the plugin should check, their respective filters, which blog author the posts should be attributed to, and which category the tweets will be posted in. After configuring the plugin, your tweets should begin to show up within the hour!
UniTweets uses the built-in WordPress cron feature to automate the process of searching Twitter accounts. While not a true 'cronjob', as long as the blog has a decent amount of traffic the plugin will effectively check for new tweets once an hour. This is because WordPress's cron runs on each page-load and checks to see if it has been longer than the scheduled interval since the function was last run. If so, it runs the function and sets the timer forward. So, while your tweets won't appear instantly, there should be a minimal amount of time between postings.
Initial release: 0.1.0.