Looks like Google have finally clarified the issue with hidden text on your website and whether your site will be penalised for it.

Like most of Google's ideology, as long as it benefits users and is not an attempt to fool search egines then it is okay to hide text using CSS techniques.

An example of this could be using the display:none element to hide answers in a FAQ list. 

SEO Roundtable has more info on this and other search engine optimisation advice - we regularly visit the site for SEO news and views.

Check out this great viral marketing campaign from Pepsi for Pepsi Max.

A customised Flash video is generated from the information you provide about a friend taken from a limited list of dropdown choices.

Definitely targeted at the young male market (which pretty much counts me out!!) Pepsi have a young woman creating a video blog about the mystery date she met last night describing him in a fairly humorous way to you the viewer. The best bit, though, is that you can upload a piccy of your mate that is superimposed onto the young woman's mobile.

This all gets emailed to the friend in question and if you are a guy you would be hard pushed not to be tempted to do the same to another mate - the perfect viral campaign.