YouTube has added new features to its annotation software (located on My Videos tab), which allows to placing links in videos and getting cross promotion.
"Annotations can be a very powerful creative tool and make videos that are engaging, informative and interactive; however it’s important to realize that overlay text and hotspots can also interrupt and distract viewers. Not every use of annotation is necessarily a good use - there is an art to it", YouTube explains in its blog.
So far YouTube has close to 100 million individual annotations in the system.
Among the improvements, there is a brand new annotation editor, new font size and new color options.
YouTube published some tips and suggestions on how to get more from this tool. Also there is a playlist with some of the best samples.