Most popular modules/add ons

I was curious to know what the most popular modules/add on were, so i could check them out before I try installing zen again. Any one you particularly like?
Thanks

Image-Handler 2.0 available from http://breakmyzencart.com/image-handler is excellent

Master Password (or Encrypted Master Password) can be real handy.

Column Layout Grid is very useful.

Image Handler 2, helps with site optimization.

Tabbed products description, allows for easy viewing and allows you to stuff more keywords into your description thereby making it more Search Engine friendly.

MSRP display, helps your customers see how much they will save of of MSRP

best advice,

figure out what YOU need for your business
follow YOUR model, cause ONLY you know what will work for your business and your customers/potential customers,

but one that I would suggest is Search Log,

it tracks what users search for on YOUR site,

GREATTTTTTTTTTTTTT for marketing,