The blogroll contains blogs that link to this one and receive a link back. While I add blogs that link to me as I discover traffic coming from them the best way to get linked is by putting up a link to my blog and then contacting me through Evemail. The blogroll is regularly maintained and discontinued blogs or blogs that remove the link to this one will be removed.
The friends section contains blogs I feel deserve a link but that do not link back to mine.
