I came across this heat-map at Google today:

This “heat map” illustrates these ideal placements for content on a sample page layout. The colors fade from dark orange (strongest performance) to light yellow (weakest performance).
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Google’s Webmaster Tools offer webmasters a free resource to make their sites more Google-friendly. They can show you Google’s view of your site, help you diagnose problems, and let you share info with Google to help improve your site’s visibility.
Matt Cutts speaks on the new features:

Matt Cutts is a Google Engineer that offers SEO [...]

Here is a rather comprehensive listing of the top ping URLs, or update services to add to your blog software’s list.
This list was updated in April 2008
http://api.feedster.com/ping
http://api.moreover.com/ping
http://api.my.yahoo.com/rss/ping
http://blogsearch.google.com/ping/RPC2
http://ping.amagle.com/
http://ping.bitacoras.com
http://ping.blo.gs/
http://ping.feedburner.com
http://ping.rootblog.com/rpc.php
http://ping.syndic8.com/xmlrpc.php
http://ping.weblogalot.com/rpc.php
http://rcs.datashed.net/RPC2/
http://rpc.blogbuzzmachine.com/RPC2
http://rpc.blogrolling.com/pinger/
http://rpc.icerocket.com:10080/
http://rpc.newsgator.com/
http://rpc.technorati.com/rpc/ping
http://rpc.weblogs.com/RPC2
http://topicexchange.com/RPC2
http://www.blogdigger.com/RPC2
http://www.blogoole.com/ping/
http://www.blogoon.net/ping/
http://www.blogsnow.com/ping
http://www.blogstreet.com/xrbin/xmlrpc.cgi
http://www.lasermemory.com/lsrpc/
http://www.newsisfree.com/RPCCloud
http://www.popdex.com/addsite.php
http://www.snipsnap.org/RPC2
http://www.wasalive.com/ping/
http://www.weblogues.com/RPC/