The New York Timesintroduced its long-delayed Beta620, a public beta-testing site where Web surfers can experiment with new products that could eventually take root on NYTimes.com. paidContent: Beta620 — the number refers to the Times’ building address on 8th Avenue — is now accessible to all NYTimes.com users, paid and unpaid (you have to be registered to comment). It was first introduced last summer in a memo and was originally slated to publicly debut a few months after. However, as resources were shifted to get the metered paywall set up this past spring, Beta620 was delayed. With the subscription plan up and running, the technology team finished the project. It is opening with seven projects/features. Mashable: The beta-testing site seems to be a step up from Insights Lab, the company’s invite-only community, where members can give feedback directly to Timesstaffers.