Facebook image sizes are continually changing. Here is a quick guide for those of you who use Pixelmator and Photoshop to create custom images for your Fan Pages.
Cover Photo:
Width: 851px
Height: 315px
Profile Image:
Width: 180px
Height: 180px
Application Icons:
Width: 111px
Height: 74px
Facebook Highlight & Milestone Image:
Width: 843 px
Height: 403 px
Status Update Image (Timeline Wall Post):
Width: 404px
Height: 404px
Maximum Uploaded Image Size:
Width: 2048px
Height: 2048px
Facebook Ads:
The Image in the ad
Width: 100px
Height: 72px
Maximum Video Size:
Size: 1024MB
Length: 20 minutes