We ran the beta for just over a month during which time approx 10% of our regular online readership switched over to the new site. This gave us a lot of valuable feedback and led to various tweaks and changes to make the site more user friendly.
We also had a fairly mamoth task of copying across 90,000 articles from the old sites and re-mapping those URLs to our new Polopoly URLs so that old links (example) from the likes of Wikipedia (example) and the search engines continued to work. Wikipedia alone had links to over 2,300 Herald and Sunday Herald articles and given its massive PageRank and search engine reputation, it was essential for our SEO efforts that these links continued to work.
It’s still early days, but the site seems to be coping well — both with the traffic and the number of articles in the system which, including our 20 year archive, is now nudging one million articles.