Icon vs Text

When use Icons? When use Text?

[1] As rule of thumb, icons alone should only be permitted when at least two out of the following three conditions apply:

1. Space is very limited (i.e., too small for text alone).
2. The icons are standardized (e.g., the floppy disk image for save)
3. The icon represents an object with a strong physical analog or a visual attribute (e.g., a printer icon to access printer attributes, or a red rectangle to set a page background red).
   

[1] http://ux.stackexchange.com/questions/1795/when-to-use-icons-vs-icons-with-text-vs-just-text-links
[2] http://designaday.tumblr.com/post/91812707/back-to-basics-icons-vs-text
[3] http://www.ixda.org/node/19518 
[4] http://uxmyths.com/post/715009009/myth-icons-enhance-usability
[5] http://www.smallfarmdesign.com/blog/2009/12/28/the-problem-with-icons/
[6] http://blogs.msdn.com/b/jensenh/archive/2005/11/01/487661.aspx