Geofizz, I'm sorry - I forgot your ds was grade-skipping, I just read ds5 and thought, heck, this kid is still young, don't sweat it
We use Spelling City for our kids - you can create your own lists and you can also search for common lists like Dolch etc and add them in easily. There are plenty of bells and whistles to keep my 7 year old entertained
I'll also second aculady's suggestion to focus on phonics as a first step.
Handwriting was mentioned above - fwiw, I'm parenting two 2e kids neither of whom can use handwriting to learn spelling (ds12 is dysgraphic, dd7 has a memory challenge and learns almost exclusively via auditory input)... fwiw I've had Phonics Zoo recommended for dd7. I haven't looked into it in detail yet so I don't know much about it. DS12 had a spelling tutor for awhile when he was in 3rd grade who used a visual spelling technique that I think would be fun and motivating for a kid who isn't challenged by dysgraphia - I'll try to remember how it worked and describe it for you... but it's been so stuffed back into my long-term storage that it may take a few hours for me to remember it!
polarbear
