asp.net mvc dynamic/relative routing

Question

I'm developing a website which has a modular structure. Every segment of the url presents an content item. For example url: www.mysite.com/blogs/programming/2010/01/

Root item is 'blogs' of type 'area'. It has a child item 'programming' of type 'blog'.

Now there's '2010/01' left of the url. Last valid (routable) item 'programming' was a blog so I need to map '2010/01' to action

BlogController.Date(int blogid, int year, int? month, int? day)

Every controller comes from a module (separate dll), which registers some item types (blog registers types 'blog' (routable) and 'post' (not routable). 'blog' can have children of type 'post'). When last valid (routable) item of the url is detected, logic knows which assembly and controller to look for. Now I need a way to invoke correct action with correct parameters.

Some routes for item of type 'blog'

{year}/
{year}/{month}
{year}/{month}/{day}
feed/
category/{category-name}/
tag/{tag-name}/
search/{*phrase}
{*post-name}

Any suggestions what would be a simple way to do the routing?