2.8.6 fixes two security problems that can be exploited by registered, logged in users who have posting privileges. If you have untrusted authors on your blog, upgrading to 2.8.6 is recommended.
We've seen a flurry of new Wordpress versions recently:
11/12/2009 - Version 2.8.6
10/20/2009 - Version 2.8.5
08/12/2009 - Version 2.8.4
08/03/2009 - Version 2.8.3
07/20/2009 - Version 2.8.2
07/09/2009 - Version 2.8.1
06/20/2009 - Version 2.8
That's seven versions in less that five months. Frankly that's too much for you - a business owner with a company to run - to have to deal with.
That's why - for most business owners - I prefer TypePad.
