ooh, I see, you know what, I found it very strange that those blogs hosts didn't care about this redirection.
Everybody take cares about this, I mean, MOST people care about this. I do it for all my sites, i.e. I redirect from non-www to the www version, since most people will be adding darn www to the domain name anyway in links.
May be you should try to let them know this, and they might be wishful to fix it. I think must be another people affected by this problem.