We use the Tummy Tub. It's similar to this one, and it was recommended to us because our son was born premature.
Here are some pictures of him in it:
http://sol.pupazzo.org/?p=550

Tummy Tubs are very popular in Belgium. They are not really intended to save storage space or water (although they do), but are said to give babies a more 'womb-like' bath experience, avoiding the position of lying on their back, stretched out in the water, which they often hate, especially in the beginning).
Now my son is a bit older, we've started using a the large size Tubtrug as a tummy tub. I really like this idea, found it in a blog somewhere.
Tubtrugs info here: http://www.tubtrugs.com

My 2 year old loves his tubtrugs bath, he can sit up almost up to his chin in the water, and since it's flexible, he can make it bend/fold, he turn around etc.
It's also great to take on vacation. You can use it as a storage bin in the car, and use it as a bath if the vacation appt only has a shower.

We stick our boy in the kitchen sink.

Yeah, we used the sink too. When he was teeny, we used a sling (that came with a bath tub that I got for a shower gift). When he could sit up on his own, he just sat in the sink. Can't save much more space than that!!

another vote for the sink.

My 20# 6 mo. boy takes his baths in his plastic baby bath tub in the regular big person bath tub. That way the water can emerge him, and we have the saftey and the support of the little tub.
It is still precarious.

I saw that in the store. That's a $30 bucket. I like the sink.

So, um, can I just use an ordinary bucket that we have around the house? And for the sink people, is it difficult before the kid can sit up or do you make it a two-person job (one holding/one cleaning)? (Pardon my stupidity...pregnant with the first kid and don't want to buy pointless things...)

The kitchen sink was the easiest. Before she could sit up I used the giant baby shaped sponge pictured here http://www.bergstroms.com/bergstroms/product.asp?s_id=0&dept_id=4388&pf_id=PABEIAFFKNCBMPMI&prod_name=Muchkin %2D Bath Sponge 5 bucks at Target

another vote for the sink here.

I recieved a tub for my shower but LittleOne has already learned to plant his feet on the edge and push off. I'm switching to the sink when he can sit on his own.

Katie73: if you use an ordinary bucket make sure you use it *only* for bathing your baby. And I'm sure and ordinary bucket would do.

Actually, an ordinary bucket would be very dangerous. The bathing buckets are very narrow at the bottom, which is supposed to prevent the baby from sliding down and going under. Also, it allows you to keep the water level high to keep the baby warm, without having so much water that they are floating.

>> And I'm sure and ordinary bucket would do.

Actually, no it wouldn't. Safety rules exists for a reason.

As for the sink, Junior learnt in the first few weeks how fun it was to push from the sides of the sink making the bath a precarious experience at best.

loki

I bought a baby tub when our first son was born and quickly returned it. Though we lived in a 1200sqft house the thought of storing that thing was rediculous. Now with #2 we are still going strong in the big tub.
Not all kids will like the big tub, but I hate all the useless "stuff" the baby industry pushes on parents, especially first time parents.