Say I've added some new links to a page. This page is already indexed, but I'd like Google to discover these links asap. Will "pinging" the site (using a tool like, say, Ping-o-Matic!) speed up the process? Or is pinging strictly for blogs/RSS based sites?
Better to social bookmark that website and ping links from social bookmarking sites. Pinging is for every type of website, but with blogs you can also ping RSS of a blog when new content is published to quickly index it.
I ping my sites about once every two months and none of them are blogs. Pinging isn't just for blogs, though.