The Strange Horizons fiction department received its 20,000th submission this evening.
Give or take. The official count overcounts some things and undercounts others; it includes most but not all solicited revisions, and some stories that got into the database before I noticed they were duplicates, and it's inconsistent about how it counts serials, and so on.
But there are now 20,000 stories in our database, dating back to late June of 2000.
And just barely under 8800 authors--again, that's not an exact count, but somewhere in that area.
It took nearly five years to reach 10,000, and just under another three years to reach 20,000.