Banner_160x600
zipped file size: 36k

Banner_300x250
zipped file size: 37k

Banner_728x90
zipped file size: 34k

Banner_300x600
zipped file size: 36k

Banner_640x480
zipped file size: 40k

Banner_320x50 Expanding
zipped file size: 45k (half will load after the polite load)