If you manage a website, you may have taken to obsessing about how quickly it loads in your users’ browser.
There are several pay services available ranging from a few Euros a month to tens of thousands of Euros a year which offer many features. But I know you want to spend absolutely nothing, and you want to see results within the next 15 minutes. So let’s move quickly on from the starter to the main course: a shootout of free, online, webpage performance and analysis services.
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Why should Jabber be interesting to someone who designs rich internet applications?
In short: it resolves the issue of polling. Poll a feed to see if a post is new, poll a RESTful URL to see if the data has changed, heck, I’ve even polled Web pages and regexed the output – controlled from a windows service – to see if a bank’s interest rates have changed. Polling is wasteful. Most of the time nothing has changed, if you increase the interval (say to a few days) then services which rely on frequent intervals (say: Nokia location based services). Even Google is using XMPP for its “Google Talk” application. The xmpp protocol is stateful. It works on the subscribe and publish model, or “callbacks” for you old skoolers.
The interesting thing is how using the xmpp protocoll will enable large communities – and more specifically the mashup services their users rely on – to scale up well. Imagine tens of thousands of facebook users tweeting to each other whenever a treasured contact uploads a picture on flickr. Companies are now building services to do just that.
Well, now you can access that goodness from c#, using two libraries, one from AG Software and another from Jabber-Net. Have fun 
Danny Dover, search engine optimization expert says:
In an effort to return to my roots, I spent the majority of the day compiling what I believe to be the mother of all technical SEO cheat sheets.
http://www.seomoz.org/blog/the-web-developers-seo-cheat-sheet
I checked it out and can recommend it too. Here’s the meat, a direct PDF download link to the cheat sheet for you.
