Im dyslexic my self... it has been a pain through my school years as the way education is conducted its mostly based on reading information for knowladge, especially at college...
But even though my grades where never really good I never blamed dyslexia.
I think that will be your most important task as a parent of a dyslectic child... to teach him to accept it but teach him to never use it as an excuse.
If you can, through out his school years, motivate him to try harder then everyone else then when he becomes an adult he will be a constant overachiver. Because the effects of dyslexia fade away with the years, usually around 20 its almost gone (though he will never be a fast reader or a spelling wiz), but what will be left that day will be his attitude to always try harder then everyone else.
When lookin at the people that I went to school and college with over 50% of the most successfull ones in their careers are dyslectics. Simply due to us beeing the ones who always try a bit harder and never quit when facing a problem.
Also when teaching him to accept his dyslexia its important for him to know that alot of very famous and intelligent people where dyslectic. Einstein for example.
He has to know he aint stoopid because of the dyslexia and on the contrary he has to belive that he is likely more intelligent then his fellow classmate, based on how many very intelligent dyslectic people there have been through history.
If you manage to teach him that and motivate him to try harder then the rest then your young lad will be very successfull in life.
TexMurphy