What is the easiest way off implementing a 'user registration' feature on my site? Once registered, visitors would be able to post messages in my forum, manage subscriptions to my mailing lists, access members-only features and so on. The problem is, the cgi scripts are completely separate from each other. Are there any scripts that can do this? So far I've found a user registration script at: http://www.interlogy.com/scripts/pm/
but this only keeps a record of registered members which makes it difficult to add extra features as mentioned.
There might be a script out there somewhere, but the odds of it featuring all the things that you want are slim to none, or less!
In this case you would likely need some custom programming work done. Such a system could be created with an intermediate-level knowledge of PHP and SQL, I highly recommend Kevin Yank's tutorial here on SP on the subject - are you familiar with it?