Probably not much that isn't already listed on the Datel site is compatible with that card.
The only real web browser for the DS is Opera, and that requires a special RAM expansion card in the GBA slot on your DS. Even then you have to find some kind of a special patch for it to run, and it won't really make the browser suck any less.
If you want to run Homebrew stuff on your DS, then you're going to have to get a real flash cart. Something like the R4DS or M3DS Real. There are some others out there, but you can research them on your own. The long and short of it is, from everything I've seen and read about that Datel card, is that it's a piece of junk. Also, Datel tends to rip off a lot of the homebrew projects. When the PSP homebrew developers reverse engineered Sony's "Jigkick" battery, Datel started selling their own version of the "Pandora" battery, and couldn't even be bothered to give credit to the people who figured it out in the first place. They've also been known to take homebrew projects and put them into things like their Games n' Music card, but strip out any obvious means of identifying that you're using Moonshell for example, making it seem as if Datel wrote the program.
Still if I had to hazard a guess about why some songs don't play and others seem choppy... The DS really isn't all that powerful of a device. You're either trying to play songs in some format not supported by that card's firmware, the encoding bitrate is too high and the DS can't process all that data, and I wouldn't be surprised if VBR MP3s were the cause of the sputtering. The DS really isn't a good choice as an MP3 player. If you want a decent, and cheap, MP3 player, you might want to consider this one.
You can then install the custom firmware Rockbox onto it, and it should be able to play back things much better than your DS ever could.
And for what it's worth, I don't really get the point of that vMac DS app. It runs OS 6, from the Mac Classic, which is from like the late 80s. You're not going to be able to get any Mac app made within the last probably 10 years to run on that thing, so aside from the initial "neat" factor, it's pretty useless. I don't even know that there's currently any way to install new apps onto the vMac image. Maybe at some point in the future they'll be able to emulate a floppy drive or some kind of AppleTalk network attached drive.
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