i have seen lots of websites,offer service,sell things and other things.
i want to know something about service we can do online. and which is popular do you think?
What kind of product/server do you currently offer offline?
Hosting is a good service to sell online. You can join cj.com as they have around 40 hosting affiliate programs. Take from there see if it works for you.
You also can promote internet marketing related services.This niche is just booming now everywhere in the web.
it depends what kind of site you run.
i’m sure if you have a agaming site, it would be a bad idea to promote hosting
Search engine optimization services is rather good niche to get into. Especially if you know what you are doing =) You can start by simply providing simple links building services.
You can always check out Fiverr 