Question is, are there any European ad systems that would provide enough relevant ads for your site? I'm not saying there aren't, and I would like to see some better competition against google in this area, but I know one of the benefits of Adsense is that they have such a large base of advertisers, they have relevant ads for nearly every topic:
I've been using Crimson Editor for the same reason and have even kept using it via Wine on my ubuntu machine. That doesn't mean I haven't tried other text editors, Crimson just does some things that all the others I've tried don't do... but I haven't tried JEdit yet, it looks promising.
One of the most difficult parts of JavaScript and web 2.0 is getting things to work on all the different browsers. Install the most recent versions of the most widely used browsers: http://www.w3schools.com/browsers/browsers_stats.asp
http://basketweavingtips.blogspot.com/2007/09/underwater-bas...
Not to mention more advertisers creates competition.