Social surfing

Remember the times when you where programming some shitty little page with php and all the book started with a counter somewhere on the page. This was a counter on how many people visited today and so on. Further the next chapter was a counter on how many people are currently on your website and if you really wanted to top things of you wrote how many logged on users and how many guest where online

From http://www.phpbb.com/community/
Who is online
In total there are 1427 users online :: 96 registered, 4 hidden and 1327 guests (based on users active over the past 30 minutes)
Most users ever online was 8680 on Mon Mar 19, 2007 1:28 am

So why doesn't someone take this to the next step and make a browser addon where you can see who is browsing the page. Something that integrates into the status bar and tells you how many people of your community are looking at this page right now. You can leave a comment, you can chat with other people viewing the page, add some tags or rate the page. This would be like browser social networking. Of course you would have to sign up with a little picture and some information but I suppose you could get this out of facebook and the lot. You would further have to blacklist some pages. Like gmail, google search and so on, you don't want to chat with all the people that are reading theire email do you.

Make a coffee machine that talks rfc2324

http://en.wikipedia.org/wiki/Hyper_Text_Coffee_Pot_Control_Protocol

erd2db

I am looking for a tool in which I can create a nice erd diagram with all the relations and then this will output SQL, ruby migrate syntax or what ever. There is something like this called toad but there is nothing open source. Further there are some dia converts that take in some dia pic and convert it to something, but this doesn't work. So please would someone write something like this.
http://en.wikipedia.org/wiki/Comparison_of_database_tools