What a pity we don't live closer I'd have put my hand up for the job!
I've been tutoring my grandson for a few years now, who has trouble with reading, writing, spelling & maths. He's never been diagnosed with a specific complaint and is considered smart, funny, creative and 'normal' in every other way.
The education department doesn't put lables on children - they all fall under 'learning disability'. There is a reading programme he may be eligible for which runs for about 6 weeks. Ask his teacher. It's quite selective - only 6-8 children chosen per year from a wide school district and it may be run in a school some distance away from your home - you may be eligible for transport if he is chosen and you have trouble getting him to & from the programme. It takes precedence over everything else so, if chosen he can kiss good-bye to school excursions, concerts, sports etc. Note: it's no 'wonder cure'. I spoke to the tutor at the end of the course and she said for many/most of the kids - it's just the way they are. If you're waiting for the penny to drop you'll be waiting a long time. But every little bit helps right?
Has he been assessed to identify his specific areas of difficulty? This may be helpful so you provide help where he needs it most.
We did get a tutor through SPELD, the dyslexic organisation - lovely, helpful people.
http://speldnsw.org.au/
The SPELD S.A. site has lots of useful info too.
http://www.speld-sa.org.au/index.php?option=com_frontpage&Itemid=55
Playing board games such as Scrabble is an area where you can help (but allow him to swap some letters with no penalty if they are too hard to make anything from.) Kids love playing board games and don't even realise they're learning! To help my grandson with counting in the early years we played pontoon (21) and dice games.
because the key to them learning is repetitiveness, but done in an interesting or fun way so it isn't boring.
Unfortunately for kids with learning difficulties the focus is on 'what's wrong with them' or 'what they're not good at' so we need to remind them that NOBODY is good at EVERYTHING and to let them know what they are fantastic at to keep their confidence and self esteem up. (I'm sure you do this already.)
In the meantime here's a great little site with literacy games to play.
http://www.bbc.co.uk/schools/ks1bitesize/literacy/