I’ve found that one of my pet hates recently is when I notice people writing WordPress as Wordpress. Notice the capital ‘P’!
I’ve been seeing more of it lately, especially in site titles. In my opinion, not using the correct grammar makes a site look a bit unfinished and unprofessional
It’s not hard to remember. One word. Two capitals – W and P. Easy-peasy. NOT two words and one capital.
Also see Justin Tadlock’s post on this subject.