Amazon is offering up to $400 off Samsung HDTVs using the following coupon codes.  This offer yields some great prices on some of the most popular TVs, beating the next lowest prices we could find by $100 or more.

Comparisons shown are the next lowest shipped price on PriceGrabber

Use Coupon Code: SAMTVTWO to save $200 on these models
Samsung LN40B750 40" 1080p, 240Hz for $1,499.99 (Slightly cheaper on PriceGrabber)
Samsung LN46B650 46" 1080p, 240Hz for $1,584.99 (vs. $1,595 on PriceGrabber)

Use Coupon Code: SAMTHREE to save $300 on these models
Samsung LN46B750 46" 1080p, 240Hz for $1,699.99 (vs. $1,799 on PriceGrabber)
Samsung LN55B650 55" 1080p, 120Hz for $2,249.99 (vs. $2,349 on PriceGrabber)

Use Coupon Code: SAMSFOUR
Samsung LN52B750 52" 1080p, 240Hz for $2,064.99 (vs. $2,139 on PriceGrabber)
Samsung PN63B550 63" 1080p Plasma TV for $2,574.99 (vs. $2,725 on PriceGrabber)