Check out zedge.net. Zedge has 1000's of ringers and other media for free. The send to phone option for some reason doesn't send anything to the phone (the instinct is on the supported phones list) but it also has a save to pc option so that once saved you can use a phone uploader such as http://pcs.cruz-network.net/index.php#r-send1 which is also free.
myxer.com is the best site I have found. No fees and they have thousands of downloads and have it set up so you can upload your own music and customize your ringtones. You can also customize ringers from music already on the site!
I've been using myxer.com since before I got the Instinct. The only issue I've had with the Instinct is I don't always get the texts to d/l the ringers, but you can go to the site on the phone and d/l from there.
i was wondering if anyone knew where to find the right size screen saver for the instinct? Every time i download a picture from any site is does not fit the whole screen when its on lock mode. Anyone know something about that??
Here's 120+ ringtones I made just for the Instinct...some loud, some louder. All in m4a format, so they work Enjoy! You'll just need to find an uploader to transfer to your phone. http://www.megaupload.com/?d=KIT6TGE7
And here I thought I found all the Instinct sites, lol...missed one, but damn glad I found you Name's Goy, I also convert movies to play on our phones too...Feel free to stop in and grab em up http://www.sprintuserforum.com/viewforum.php?f=12 ( I administer on that site )