I don't think keyword density is so important now as having links with keyword anchor text is one of the strongest signals about your site.
Google definitely has a monopoly on search engines!
The keyword in the domain is still important in the ranking and always will be, just at varying degrees as google occasionally adjusts its value.
I like google webmaster tools and statcounter the best.
Sometimes you think you are in the Google Sanbox but it can also be because your seo is screwed up.
90% of all my search engine queries come form google so forget the rest and just optimise for google.
Google Webmaster Tools as it tell me how google views by websites.
Never under estimate the power of having good anchor text on all inbound links as this can make your break your serps.
I use internet explorer 99% of the time and occasionally on firefox if an application doesn't work in IE
You load the xml sitemap into google webmaster tools.
I don't waste much time on Bing!
Certainly no help from me!
Just google search engine submission. It will usually take a week for a submission to turn up in search results.
Just having a site cached it not enough to start getting lots of traffic. You need to apply all the SEO tactics to get it more prominent in search...
I did link farming a few years ago and my websites went downhill so I don't do it now!
I wouldn't waste much time on twitter because its a spammers paradise and google will slam it sooner or later!
They have disappeared!
I don't use Bing myself but find I am getting around 6% of hits from it!
Having schemes to increase adsense clicks is clearly against googles terms and conditions!
Updating your content will attract google to keep indexing your site!
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