After my SEO plugins for wordpress and backend plugins for wordpress most people would think that should cover most of the things anyone would need. However I can think of two that are needed right off the bat.
Search Link Plugin
When you are working/writing in wordpress or editing posts of other authors, sometimes you want to link certain words that aren’t already linked. When Clicked this plugin would go to a search engine and return the top 5 results for the highlighted term(s) allow you to click one and automagically generate the hyperlink for you. I say the top 5 because not everyone wants to link to wikipedia (looks squarely in the direction of Google). Ideally you would be able to set a default search engine of your own choosing, but also be able to use the results of any other search engine thru tabs or a drop down interface. Yes it’s simple and easy to highlight the text, click your custom configured center mouse button to execute a search and copy the result URL of your choice, but efficiency comes from streamlining little tasks that are performed hundreds and thousands of times each year.
Amazon Auto Link Plugin
This plugin would automatically recognize amazon product links and append your affiliate ID onto the end. For example if I were to write a post saying I found the History Channel Revolution DVD series particularly enjoyable (which I did), I would use this link http://www.amazon.com/History-Channel-Presents-Revolution/dp/B000IB0DD0/. To make that an an affiliate link I would add my affiliate ID to the end http://www.amazon.com/History-Channel-Presents-Revolution/dp/B000IB0DD0/myaffid-123. Sure it’s easy if you have only a one author blog and have an easy to remember ID number, but it becomes more important on multi author blogs. This plugin would automatically add the affid onto the end. I suppose you could appease the Google Gods by adding a nofollow option as well. Again it’s all about automating and using computers for repetitive menial tasks so you can move on to bigger less tedious things.
If anyone knows of plugins that have this functionality or is willing to donate some programming bandwidth write them and kick them into the public domain, drop a link in the comments, and I’ll modify this post to link to them.