I like the blogger.com blog which comes when you hit blogger.com (its below the login form). Especially this post about babes at blogger. Gives the firm that personalization touch, dont you think? As it is, it is way more interesting than Google Blog :-)
It's kind of difficult to have a corporate blog that readers come repeatedly to. Generally, if you are a well known firm like Google, HP, IBM, Accenture, et al, then having a blog makes good sense. What we see though is that people use blogs to make their companies famous!! I should not call those people fools since we were about to be one of them, when we thought other wise. Having a blog is good, but it should act as a PR tool and not as a marketing tool.