iCandy looks very interesting. It's nice to see an innovative use of existing technology like that. This sort of thing would be particularly cool on a smart phone. I could see this sort of thing being used sort of like hyper links in the real world. If the program doesn't already have it, it would be nice if they added a way to export the code label things (and only that, not the entire card) as an image in a common format. That way, they could be added to all sorts of things to link them to relevant information out on the Internet. For example, the signs in a museum could have use these things to link to more information online. This has a lot of potential.

That future Linux client might be problematic, if itunes is absolutely required rather than just needed for full functionality. There is no Linux version of itunes and, to my knowledge, no one has been able to get it working correctly under wine.

One other note, in case you were thinking of trying to get it running on Linux the quick and dirty way: The Windows iCandy client does not run correctly under wine on my system (32 bit Ubuntu 8.10 with fairly standard software and hardware), though it seems to install just fine.