I'm not sure about this but this is quite strange ... I wrote an article last day on my blog: Google New Site Search Feature. I noticed this thing happening at my end .. later on i checked this on a windows machine using same IP .. which was on lan in my office and it was not working there ... i checked this again with some other windows system using diff IP but it was not working anywhere ... but it was working on Linux everywhere ... is it totally co-incidence ??? or its truth ?? Please advice and let me know if you are able to see this: also dont forget to mention your OS !!!
Just search craigslist and tell if you can see some king of search box under the sitelinks ? and what OS you using !!