I have added a search engine to this site. You can now search the Seinfeld scripts. Read more here.
When you use the search box at the top of each page, the search results will open in a new window. This is handy when you are responding to a message and you want to search for an episode without leaving the current page.
You can still ask "what was the episode when"-type questions in this forum - or you can search the scripts. It's up to you.