I followed the tutorial and got it to work - but not on my first try. Certain lots it doesn't work on. Jade posted a link further down in the thread that discusses the problem. It seems to not work on lots that are facing a certain direction or on corner lots. What I did is find a lot that it did work on, make the street parking and then move the lot to the lot bin. This became my "template" for street parking. You can then place this lot in the hood - even in spots where the tutorial didn't work - and have street parking. Of course, this doesn't help with existing lots that you ant street parking on.
Here is what the street lookied like with the template lot placed on both sides of the street. I'd offer the lot to you, but the BBS cleared off the download and I've since nuked this hood. I might make a couple of templates in a week and put them back up for download.