I picked up MT-Outliner that reads an OPML file, and exported my OPML file from NewsGator. What I don't like is that NewsGator export doesn't see the folders I am using within Outlook, so the OPML file is just a flat list of all the blogs, which isn't very elegant. I'd like to display this list grouped by blogs to which I have added my own meta-data.
I will also have to remember to copy the OPML file every few weeks, as my aggregation changes regularly. Yes, I know that NewsGator offers an online service, but I am not planning to pay for that just to have my blogroll up to date.