Searches you have two options. Your normal browser one if you know what you want there, otherwise go to Free SF Reader, which is where all the posts are, this is just a list.
Free SF REader
Otherwise, see top left hand corner of blog, search via that box. For instance :-
to search for 'greg egan' and entering will return you this url :-
http://freesf.blogspot.com/search?q=greg+egan
That should solve your problem.
Yes, some interviews and excerpts for people I am interested in, certainly. Thousands that are not, though.
Another way is by author but not as up to date
Go to :-
http://freesf.awardspace.com
The latter is only likely to be updated every month or so, as takes a while.