An iconfu subscription offers a number of enhanced features:
designing an icon can take hundreds of individual edits, and it's much simpler when you can just go back to a much earlier version to try out a new idea.
up to 48x48px
embed copyright, attribution or any other data directly in the PNG file you create
Use icon collections to build icon sets that are meaningful for you, to describe the set, explain it, link to relevant sites using it. An icon collection is a showcase of your artistic taste and sense in graphic design. Use collections to promote your icon skillz and your web design business.
Finally, with your support iconfu can remain the internet's most popular online icon editor!
See subscription options for more details and prices.