Liquidicity is presenting these quality & free vector arrow icons.
There are 16 types of arrow icons (+ the rotations which equal to 64 icons).

Considering there are several types of arrows included, the set is very handy to be used in any type of design/application.
They can be downloaded as an Adobe Illustrator CS2 file or in SVG format.
Weather icons are very handy when displaying the weather status, generating a weather based content & more.
You can even customize the look of your website according to the weather conditions (CSS-Tricks has a nice tutorial on this).
There are beautiful free weather condition icons that can be used. Here is a collection of them:

Set contains 22 glossy weather icons.
Sizes are 16*16px to 128*128px. They are in both ICO & PNG format.

This set includes 10 icons & presented in a 1 PNG file.

47 sticky weather icons in PNG format.
All the icons in the set are very detailed 6 high quality.

47 flat weather icons in PNG format & 128*128px size with:
- 8 color combinations
- In English 6 German
- Several combinations of some icons
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Simplicio is a simple looking but a quality & free icon set.
The set has 78 icons & the download package consists of ICO, PNG & AI files.

Icons are in 128*128px size. They are created by Neurovit & published by Smashing Magazine.