Archiving?

I've been using PlannerMode for about a year now with some degree of
success.  One thing that's getting me down is that now my directory is
filled with a zillion little files... one for each day, at least.
There are also a fairly large number of files for projects which were
finished or became irrelevant months ago.  It would be nice if there
were a way to archive things without breaking the links.  For example,
all the 2005.* pages, along with perhaps all of the project pages for
which all tasks are completed, would be moved into a directory called
'2005.'  

The sticking point is that all of the files with links to these pages
would need to be updated.

How do other people deal with this?  Just leave the files be?  Or is
there some slick way to do it?

Thanks,
Greg