I thought it would be nice to make a list of “the plugins that I cannot do without”, In alphabetical order:

• Add Meta Tags; Adds the Description and Keywords XHTML META tags to your blog‚Äö√Ñ√¥s front page and to each one of the posts, static pages and category archives.
• Akismet; Akismet checks your comments against the Akismet web service to see if they look like spam or not.
• cforms; cformsII offers unparalleled flexibility in deploying contact forms across your blog.
• Dagon Design Sitemap Generator; Generates a fully customizable sitemap.
• Exec-PHP; Executes <?php ?> code in your posts and pages.
• Google XML Sitemaps; This plugin will generate a sitemaps.org compatible sitemap of your WordPress blog.
• Lightbox 2.04; Used to overlay images on the current page.
• NextGEN Gallery; A NextGENeration Photo gallery.
• Search Pages; This makes search queries look at pages and posts instead of only posts.
• Themed Login and Register; This plugin creates custom login and register pages to replace the wp-login and wp-register pages.
• Woopra; An ingenious on-and offline website traffic stats program. Brand new and gaining in popularity fast!
• WordPress Database Backup; On-demand backup of your WordPress database.

A few plugins that I started to use for some websites lately, so I still can do without, but they are very useful

• Angsuman’s Translator Plugin Pro (paid); Translator Plugin Pro translates your blog dynamically to thirteen additional languages.
• Breadcrumb Navigation XT; Adds a breadcrumb navigation showing the visitor’s path to their current location.
• Per-Post CSS; This plugin allows you to specify a chunk of CSS, which will be included in the header only when viewing that post, or a page where that post appears.