The two examples at the end of my earlier comment inadvertently illustrated a point several others have made: there is no one single standard for how to capitalize a title.
Specifically, I didn't capitalize "are", but the page I linked to says you should capitalize "Are". So using their style (which is probably what I'd use too if I'd been paying more attention), my examples would be:
Sticky Notes Are Catching On
Sticky Notes Are Catching on Tables
Either way would be correct under one style guide or another. Wikipedia has a chart comparing various title case styles:
Specifically, I didn't capitalize "are", but the page I linked to says you should capitalize "Are". So using their style (which is probably what I'd use too if I'd been paying more attention), my examples would be:
Sticky Notes Are Catching On
Sticky Notes Are Catching on Tables
Either way would be correct under one style guide or another. Wikipedia has a chart comparing various title case styles:
http://en.wikipedia.org/wiki/Letter_case#Headings_and_public... (edit: stordoff posted this earlier)
Here's an interesting article on About.com:
http://grammar.about.com/od/tz/g/Title-Case.htm
And an online title case converter (with its own set of rules):
http://individed.com/code/to-title-case/
As I mentioned, this search will tell you more than you ever wanted to know on the topic:
https://www.google.com/search?q=title+case