Hi, i decided to write my favorite Wordpress plugin list for blogs which are used by multiple users to publish articles.
I created many WP blogs for publishing PR (press release, advertising articles)
revisioner - revisions are old, automatically saved versions of posts, saved while editing post, they can double, even triple your mysql database space. You can now limit number of revisions, disable it or clear existing revisions.
ban hammer - ban certain email domains from registration on your blog. like .ru, .cn etc.
WP-PostViews - Ads a new column to administration Post list (number of views), you can sort according that.
Search Regex - Search or Search&Replace in Post title, post content, post url, post meta, comment text, comment author, comment url, comment email using regex or simple search.
Remind me deep linking - when writing a new post you are presented with lsit of related articles and you can easily link these articles from your post (deep linking, interlinking articles), a must plugin if you care about google ranking and article usefullness for a visitor.
Counterize - heavy weight free detailed visitor statistics for wordpress. keywords, referers, IPs, countries, most visited pages and much much more, you should find all what you need there.
Anti-Spam - a must comment antispam filtering plugin TOP choice.