Prior to this you could just fill out the form and list where you were staying on the main application form.
This could be a hotel, an apartment block etc.
No longer.
I've just learned from the Thai Consulate in Hull, UK that to get one you now have to list and sign the actual address of a friend or member of your family on a separate sheet with your signature stating such (Friends and Family).
There's another one for if you're visiting a pensioner (and we know there's a few on here

For a volunteer charity there's yet another separate form to fill out, this is a bit more complex as they want more details.
This is NOT for Retirement Visa btw.
I had a strong feeling this was coming though.
Too many people were abusing the system and I feel that a few of the criminals out here that have been thrown in jail (including that murderer down in Phuket) were on Non Immigrant O visa's.
So now this is the result.
Mark my words if they want to take this further the next step will be police reports and interviews to be submitted for visa's, I've gone through this bs for my work overseas and it's not pleasant as you have to travel to an embassy in your home country's capital city, hours waiting etc.