How to Engage People in my Forum

Hi,

I am running a blog and a forum of same niche.

I have already applied following:-

a) Weekly/Quarterly Newsletter
b) Comment Reply Notification
c) Facebook Fan page
d) Google+ Page
e) Twitter Update
f) Occasional Mail to All

I am seeking your suggestion, how to boost engagement of the community members.

I also like to share my ideas, likely to be implemented:-

a) Free Gifts to Members
b) Special Gifts to Winners

Do you know any service where I can purchase a customized gift in bulk (say 1000) and deliver to multiple address?

Regards