For image resizing and conversion, Mihov's Image Resizer is nice and quick.
MIHOV'SAlso for quick and easy screenshots in several formats, custom sizes or entire screen etc, I use Hoversnap. Keyboard shortcut, drag a box or snap the screen and saves/names how you set it up.
HOVERSNAPBoth are freeware I've used for a good long time.
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Xbox 360 & PC
•AMD Athlon 64 X2 DC 6000 •3GB PC2 5300 DDR2
•BFG GeForce GTS 250 OC, 1024MB GDDR3 •Creative SB X-Fi Fatal1ty Pro / Logitech Z-5500
•Win 7 RC 7100 / Vista Home Prem / XP Pro (who knows, varies with the wind)