Ireland
We're about to start taxing laundry tablets here due to the fact that they're unnecessary packaging. The pack will be subject to a fairly small 25cent levy, but it's itemised on your till receipt etc so it does make you think.
We introduced a 22cent charge per plastic bag a few years ago and it cut plastic bag usage by almost 90%. It wasn't that the charge was so high that people would not pay it. Rather, it was more that because each bag has to be scanned through the till individually and that you have to individually ask for them and tell the shop how many you think you'll need etc makes people think more.
Most people bring their own shopping bags to the supermarket thesedays. It's just frowned upon not to.
Personally, I think detergent tablets are just a marketing gimick. There's very little advantage, if any, to using them. In fact, most of them have drawbacks e.g. they don't necessarily disperse as well as a powder or can clog your drawer, particularly if you've low pressure water or you're doing a very small load.
They're also more expensive and you loose the fine dosing control you have with a powder or liquid.
Can't really see the point!
Dishwasher tablets are mostly self-dissolving and non individually wrapped, so I can kind of see an advantage to them. Also, dishwasher dosage is not really varied too much.
That being said, the packaging on some of those tablets is ridiculous! Finish Quantum in particular!!!
Sun tablets are just in dissolvable packs in a single plastic bag inside the box and the same with P&G Fairy active bursts which are just in a ziplock bag.
Overall, I think laundry tablets are a waste of time though!