Andy,
I'm a programmer, people like us lack social skills
And however it wasn't my intention to judge you in anyway (so no need to defend yourself), and just a typo most of the time really isn't a big deal, but it can be something a customer takes into his decission.
I myself always pay attention to those 'details', like a year ago I had to select a third partner to whom we wanted to outsource all the internet/technical related work. In that process I kicked out a few parties in the very beginning just because of the fact their proposal was full of spelling mistakes, no effort put in the lay out of their document (not even stapled, just a bunch of loose paper in an envelope). Technically you're right if you say it doesn't say anything about the level of their skills, but to me it says something about the way they work. If a candidate doesn't even seem to care to deliver a nicely made and pretty much error free document, they don't care enough to be part of my business. Especially when people can choose from a wide range of candidates those things start to count.
Anyway, enough bout this, hit me up on icq or through email [jeroen[at]nightwork.org]. I got some questions for you.