Wordpress needs an Uninstall Option for Plugins
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When you deactivate a Wordpress plugin from your Wordpress blog it leaves over some data in the Wordpress Database. You can classify it as garbage or sometimes useful garbage. 
The data might be useful sometimes and helps you when you reactivate the plugin because it leaves over some options and/or database tables. It should be plugin author’s responsibility to delete any necessary overhead (including options and/or database tables) that a plugin might use and have it removed at deactivation or atleast provide a manual to do so. The plugin adds only 1KB or 2KB data to the database but if you install too many plugins it can result in very much size of the database, even upto 10 to 20MB!
Only some plugin authors add this compatibility to their plugins to remove all options and data used/added to the Wordpress installation.
I got an idea for next Wordpress release, 2.5 . Wordpress developers should add an Uninstall option in the Plugins page for each plugin so that the user can remove the data or options added/used by the plugin. Going to add it to the ideas area in Wordpress site. 
What are your views about it? 
Update: From my research i have found that there is a plugin for Uninstalling Wordpress plugins but it would be great if the developers can add it directly into Wordpress.
Stumble it!
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I agree you should be able to remove the database info without having to go into phpmyadmin. However, I doubt having a few extra tables in your database will matter if you’re on a decent hosting.