I've had a look at some of the online games in my bookmarks file. These are all browser based games, and most of them work fine in either Internet Explorer or Firefox, or both. I've tested them on the Wii, and compiled a list of games that work quite well, with minimal effort, using the Wii Internet Channel.
The DS browser doesn't support Flash, and only limited JavaScript. And I don't own a Playstation, or an XBox, and I have no intention of getting one, at least until I win the lottery or otherwise fall ass-backwards into a pile of money or something. Therefore, I haven't tested these games on anything except the Wii. If anyone out there has tested these games on DS, PSP, Playstation, or XBox please let me know. (Does XBox even have a browser? I don't know that it does.)
I claim no responsibility for the content or safety of any of the links on these pages. I've tested and rated the games themselves, and that's all. To my knowledge, I've never gotten a virus or spyware from any of these sites; at least nothing more than a cookie; but I make no claims that they are still or will remain that way.
The games do not generally contain any adult content, but I have no control over the games. I only link to them, and the content may change without my knowledge. Where possible, I've provided advanced warning if any of the ads on the page are adult in nature. But I have no control over that either, and I might have missed a couple.
To try some games that don't work in the Wii Internet Channel, click here. These are some pretty good games that work in most browsers. You might need a plug-in for some of them, but they otherwise work.
To try some games I'm still testing, click here. These are straight from my bookmarks, so they will work on your PC. But I haven't tested them on the Wii yet.