May I propose that we use the 50,000th post to express our thanks to anu for creating this wonderful forum for us?
To implement that:  I have created a new screen name, "Fifty Thousand", for which the password is "50,000".  Any one of us can sign on under that name.  Post #50,000 can be made under that name, and every one of us can then edit it to had his/her own personal thank you to anu.  It will be akin to a thank-you card signed by each of us.
(This, pre-edit, is post #49734. We can watch as 50,000 approaches; whoever posts #49,999 can then immediately re-sign on under the new name to lock in post #50,000.)
(has been edited to give new password)