Seems you are asking two questins at once:
How many games are released as dvd-r:
I think the answer would be none. "Backup" games are released in .iso format. What media you burn that iso to is your decision.
How many games are DL:
one ,IIRC, and its SSBB

 

Only SSBB is dual layer yet.

If you mean legit releases on DVD-R DL, none. Nintendo doesn't allow such things. "DVD" isn't the actual name of their Wii disc format for that matter, instead they're an unlicensed clone of DVD.

 

I think the DVD-R DL are very expensive! Esspecialy when you take brands like PHILPS, Verbatim (Mitsubishi) it costs more then £ 1.50 or € 2.60

I hope Nintendo will release only DVD-R single sided games

 

I know this is going to be a noob question.

I know that you have to have a certain LG Optical Drive in order to read Wii and Gamecube discs.

But what about burning them? Can I use my Sony Nec Drive to burn Wii games to DVD+R and play them on a modded Wii?

Also, what is the recommended media type? I know it is Taiyo Yuden DVD+R for the PS2 and Ritek G04 for the Gamecube.

Thanks in advance

 

Most burners will do the trick, recommended media are Verbatim and Taiyo Yuden.

 

Playing NTSC SSBB from verbatim 2.4x DVD+R DL since it was dumped. No problems. Wii still reads other disks fine. If you think you can "kill the laser beam in the Wii" by using a DVD+R then you need to do some more research about optical media and devices.

 

Wrong. It's a Pioneer 215 with firmware 1.18. SATA FTW