I'm new to WordPress CMS and have just created a site+blog using it. What set of plug-ins do you recommend me to install? I believe there are some useful, proven and "must have" WordPress plug-ins for SEO, optimization of the site, social network and bookmarking services, spam prevention, etc. that you usually use in your projects. Thanks!
PS The question I ask might look as subjective, but I believe there is a certain set of plug-ins which is useful for every WordPress project.