I followed the isnstructions in http://code.google.com/p/caliper/wiki/OnlineResults?show=content and have a key generated for me. I put this key into the file ~/.caliperrc in my Linux machine and defined the account on Google. When I run my benchmark nothing happens there: on my page on http://microbenchmarks.appspot.com it is "No benchmarks yet".
So, this should definitely work for you. A few things to check:
You included the whole line. The "apiKey:" part is necessary. So you should have a whole line that looks like: apiKey: ffffffff-0000-0000-0000-ffffffffffff
It could be that there are connectivity issues. You're not behind a proxy or something are you? If you need to, you can specify the proxy as: proxy: foo.com:8080