which addons are cool or usefull for members?

[globalinsites]

Hi,

What are addons that I can make available to paid members only and which members find particularry usefull or cool? I want it to make attractive to members to upgrade to paid access.

Thanks. Rik.

[filburt1]

At my site, I'm using my mail hack, extra turtle dollars, ability to close their own threads, and special formatting/awards. All but mail are available here or built into vB.