www.irfanview.com
it is an image viewer and can open targas so no more big pics are pics with horrible compression. u have to turn compression quality down below 40 to see any real difference. it is what i always use and most of my screen shots are about 70 kb. try and make sure that everyone gets this and uses it.
(1 x = read only

Graphic formats:
ANI, CUR Animated Cursor X
B3D* BodyPaint 3D format X
BMP, DIB Windows Bitmap X X
CAM* Casio digital camera format (JPG version only) X
CLP Windows Clipboard X
CPT CorelDraw Photopaint format (CPT version 6 only) X
CRW* Canon RAW format X
DCM/ACR/IMA* Dicom/ACR/IMA file format for medical images X
DCX Multipage PCX format X
DDS* Direct Draw Surface format X
DJVU, IW44* DjVu File Format X
DXF, DWG, HPGL* Drawing Interchange format, CAD formats X
ECW* Enhanced Compressed Wavelet X X
EMF Enhanced Metafile Format X X
EPS Encapsulated PostScript (TIF preview only) X
FPX* FlashPix format X
FSH* EA Sports FSH format X X
G3* Group 3 Facsimile Apparatus format X
GIF Graphics Interchange Format X X
ICL, EXE, DLL Icon Library formats X
ICO Windows Icon X X
ICS* Image Cytometry Standard format X
IFF, LBM Interchange File Format X
IMG* GEM Raster format X
JP2, JPC, J2K* JPEG 2000 format X X
JPG, JPEG Joint Photographic Experts Group X X
JPM* JPEG2000/Part6, LuraDocument.jpm X X
KDC* Kodak digital camera format X
LDF* LuraDocument Format X X
LWF* LuraWave Format X X
Mac PICT, QTIF* Macintosh PICT format (Quicktime required) X
MNG, JNG* Multiple Network Graphics X
MrSID, SID* LizardTech's SID Wavelet format X
NEF, MRW, ORF, RAF, DCR, SRF, PEF* Digital camera RAW formats (Nikon, Minolta, Olympus, Fuji, Kodak, Sony, Pentax) X
NLM, NOL, NGG* Nokia/LogoManager files X
PBM Portable Bitmap format X X
PCD Kodak Photo CD X
PCX PC Paintbrush format from ZSoft Corporation X X
PGM Portable Greymap format X X
PNG Portable Network Graphics X X
PPM Portable Pixelmap format X X
PSD Adobe PhotoShop format X
PSP* Paint Shop Pro format X
RAS, SUN* Sun Raster format X
RAW* Raw (binary) data X
RLE* Utah RLE format X
SFF* Structured Fax File X
SFW* Seattle Film Works format X
SGI, RGB* Silicon Graphics format X
SWF* Macromedia Flash format (Version 4 only) X
TGA Truevision Advanced Raster Graphics Adapter (TARGA) X X
TIF, TIFF Tagged Image File Format X X
TTF* True Type Font X
TXT Text (ASCII) File (as image) X
WAD* WAD3 Game format X
WBMP* WAP Bitmap format X
WMF Windows Metafile Format X
XBM* X11 Bitmap X
XPM* X11 Pixmap X
Video/Audio:
AIF Sound file, Audio Interchange Format X
AU, SND Audio format used by Sun and NeXT machines X
MED* MED/OctaMED sound format X
MID Musical Instrument Digital Interface (MIDI) X
MP3* MPEG audio layer 3 format X
OGG* OGG Vorbis sound format X
RA* Real Audio sound format (Real Player required) X
WAV Windows audio file X
ASF Advanced Systems Format X
AVI Audio Video Interleaved X
MOV* QuickTime Movie format X
MPG, MPEG Moving Pictures Experts Group format X
WMA, WMV Windows Media Audio/Video format X