After looking around for a screen protector, I was outraged by the price of these things ranging in price from $6 plus shipping on Ebay to $20 at my local electronics store.
The one that came with the 604 WiFi is still good, but It has developed a few scratches over 3 months so I decided to look around for an alternative and here is what I came up with.
I went to the local Wal-Mart store to the fabrics department and looked around for some clear vinyl. They had about 6 spools 4 feet wide. The difference between them all is thickness. I decided to purchase 1/2 a meter of the lightest gauge which is still a little thicker than the screen protector that came with the 604 WiFi. You can buy it in smaller amounts, but I had a few other projects to make protectors for (cellphones, touchscreen remotes, touchscreen computer screens and other mp3 players)
I cut out a small square about the size of the 604 with scissors . I then placed it over the 604 screen and took a fine marker to carefully trace out the screen size. Now for the hard part, getting straight cuts. I used a Photo paper cutter. You just lie it on the cutterbed and pull down the handle. You can use scissors if you don't have a cutter. If you make a mistake, don't worry, you have enough to make about 30 more :)
Now, test the screen protector for fit. Trim off any oversize. Make sure it fits without binding on any of the edges. Now to make it stick.
Take something small like a pen or stylus and dip it in some clean water and let a very small droplet of water hit the center of your wifi screen. Place the cut to fit protector over the screen and gently use a credit card to squeeze the water droplet and any bubbles out to the edges.
Let the water evapourate and it drys clear. Make sure you don't put anymore than a droplet.
If you were happy with the protector that came with the 604, then you will be really happy with this. It does not dent as easy looks invisable with the unit on, and I think the touchscreen is actually more sensative.
is a Template to print out and use to cut the exact size needed for the screen of the 605. Let us know if it works for the model you are trying it out on.
TOTAL COST .99 Cents