It is very convenient to work with. I'd hate persuading people everytime that OUR technology, OUR principles, OUR approach are BEST - and with Drupal I don't have to. I simply give people links or show papers. Lately, I just give this reference (from Drupal community site):
Drupal has won two prestigious Packt Publishing 2008 Open Source CMS Awards this week - the Overall 2008 Open Source CMS Award and the Best PHP Open Source CMS. This marks the second consecutive year that Drupal has won Packt Publishing's Overall Open Source CMS award. In addition, on Monday, Packt Publishing recognized leading Drupal contributor Earl Miles as a 2008 Open Source CMS Most Valued Person (MVP).
To win the Best Open Source CMS Award two years in a row is quite an achievement for Drupal, said Damian Carvill, Packt Spokesman. In what were extremely close categories, with high quality finalists, Drupal's strength and power shone through for the judges. Particular praise was reserved for the development team's dedication to improving Drupal alongside building a loyal and passionate community, that has enabled its growth, adoption and advocacy. Congratulations from Packt both to the development team and to the community!
The Packt Publishing awards highlight the growing impact the open source Drupal social publishing system is having on the content management system (CMS) market, specifically with a growing number of case studies in vertical industries such as media and entertainment companies, educational institutions, and non-profit organizations. Drupal usage has grown exponentially in recent years with more than 2 million downloads and an estimated 250,000 Drupal websites worldwide. The Drupal community includes more than 350,000 registered members on Drupal.org.
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I like consulting people on their existing websites - and in 90% of cases it's free.