Here's one i don't think has been mentioned: i'm ready to be slated by the mathmeticians!!
For Crosswind component ..... Wind Angle + 20 in % = XWC
ie Rwy 26 Wind 300/30 (40+20) = 60% = 18kts
For Headwind Component ...... 110 - Wind Angle in %
ie Rwy 26 Wind 300/30 (110-40) = 70% = 21kts
Seems to work fairly accurately, I also like the clock method and of course the good old graph, especially when winds get a bit close to the limits!