I have installed Google Analytics code in several of my sites and found the reports to be fantastic. Since it is a free service, you will expect a lot of webmasters will sign up and install the code.
Hence demand must be so great that I notice that I am no longer able to add additional profile today. Just checked on new sign up page noticed that Google has also suspended new sign up while they work to increase capacity. Reporting on the newly added sites has been slow due to great demand. No complaint so far as it is really a good service from Google.
Google Analytics has experienced extremely strong demand, and as a result, we have temporarily limited the number of new signups as we increase capacity. In the meantime, please submit your name and email address and we will notify you as soon as we are ready to add new accounts. Thank you for your patience.