WordPress Plugin List that I use

404-to-start

Sends every 404 page not found error directly to start page (or any other page/site) to overcome problems with search engines

AddThis

Help your visitor promote your site! The AddThis Social Bookmarking Widget allows any visitor to bookmark your site easily with many popular services.

Akismet

It keeps your site protected from spam even while you sleep. A must have this site has many spammers hitting each day the plugin put them in spam folder making it easy to manage.

All in One SEO Pack

SEO for your WordPress blog.

Easy Privacy

Automatically adds a privacy policy page that includes an Adsense compliancy section. Configure it at Settings → Easy Privacy.

Google Analyticator

Adds the necessary JavaScript code to enable Google’s Analytics.

Google XML Sitemaps

This plugin will generate a special XML sitemap which will help search engines like Google, Yahoo, Bing and Ask.com to better index your blog.

SEO Friendly Images

Automatically adds alt and title attributes to all your images. Improves traffic from search results and makes them W3C/xHTML valid as well.

SEO Slugs

Removes common words like ‘a’, ‘the’, ‘in’ from post slugs to improve SEO.

WP Smush.it

Reduce image file sizes and improve performance using the Smush.it API within WordPress.

Paid Plugin for which im an Affiliate

EasyAzon

Quickly and easily insert Amazon affiliate links into your blog as either text or image links or as info boxes with a variety of information from Amazon.
can live with out this one. See pedometersstore.com (part of VBL community niche challenge) to see it in action.

The most important thing for me is can add amazon affiliate ID’s for each country. If a none .com customer visist you niche site and goes to tehre local amazon site you will not recieve commision without this feature..