If your dream company doesn't currently have a job listing that matches your skills, you're forced to continuously check back. And if you find the posting after a long period, it might be too late. Would you use a tool that scrapes your favorite job sites to notify you of new listings? Or, do you have some way of managing this problem already?
I use my own google custom search engine for this. You index the main job sites you are interested in and you just need to run a periodic search using your own search engine using the keywords you are interested in. It is best also to add the year of interest. Haven't figured out a way yet to filter out old archived job ads.
I like <a href="http://sitestalker.net" rel="nofollow">http://sitestalker.net</a><p>Enter URL where you expect the job listing to show up, some keywords and you get notified via email when the job gets published