If I was looking at a resume that had typos in it, I would toss out that resume. Especially for a programming job. It's not a great leap to imagine that the applicant's code is sloppy, too.

When I'm looking for a company to buy a theme or plugin from, or to hire to work on WordPress for me, their website is their resume. If it misspells WordPress, they've instantly lost my confidence. First impressions are important.

Now let's be clear: if I get an email or tweet or IM or whatever from a developer or project manager that misspells WordPress, I'm not going to care. That's an entirely different scenario than misspelling WordPress in your marketing material, which I believe is what this post is specifically about.