Ticalc has an April's joke that made me laugh. See
http://www.ticalc.org/
The joke is a fake announcement that reads:
ticalc.org Introduces New In-Program Ads
Posted by Michael on 1 April 2007, 02:06 GMT
As many of you know, in November we began running ads on
ticalc.org in
order to cover our bandwidth costs. While this trial run has proven
highly effective, we are still falling short each month on ad revenue.
Feedback has shown that our visitors are overwhelmingly against any
form of graphic banner ads, so we are instead turning to something
more creative.
Beginning in the next two weeks, all BASIC programs uploaded to our
archives will automatically be edited to include pay advertising,
similar to what is shown in the animated screenshot. This will allow
advertisers to pay lump sum fees for perpetual product placement in
the BASIC portion of our file archives and should solve our immediate
financial situation.