Make a fresh WordPress install and archive all your tweets:

• It's easier to search than on Twitter
• WordPress is not limited to the most recent 3200 tweets
• It will automatically expand all those ugly t.co links
• All your #hashtags can be converted to WordPress tags

Plugin's page: Ozh' Tweet Archiver

Live example: Ozh' Tweets

Development: on Github

The changelog can be found:

1. In the plugin source itself
2. Here: https://github.com/ozh/ozh-tweet-archiver

Installation is, as usual :

1. Upload files to your /wp-content/plugins/ directory (preserve sub-directory structure if applicable)
2. Activate the plugin through the 'Plugins' menu in WordPress
3. Refer to the official plugin page for documentation, usage and tips