The blogs provider has an attribute - urlRewriteFormat which specifies the url format that is generated by a blog post. You can control the attribute value from the web.config - cmsEngine/Blogs provider
which will allow you to make the old urls almost unchanged.. You should also change the urlWhitespaceChar which is set to underscore. I think the default char for wordpress is dash. So
the Telerik team
Registration for Q1 2011 What’s New Webinar Week is now open. Mark your calendar for the week starting March 21st and book your seat
for a walk through all the exciting stuff we ship with the new release!