Bountyhunter:

A tiger toothed saw is a saw where the teeth are arranged so one tooth will face one way while the next tooth in line faces the opposite direction. It's difficult to explain in words, so I snapped a picture of my saw:



Now when it comes to sharpening, I get my tools sharpened professionally. Well mainly my saws, my straight bladed pruners and shears I can manage. Those saws are very hard to sharpen, and the cuts from them are not nice. I've cut myself before when not using gloves. I recommend gloves, cloth or leather, it doesn't really matter unless you really hit your hand hard, then leather would be best.

The saw I have happens to be a STIHL. I've been using it for about two years now and it's great. I have the PS 60 Pruning Saw with the 9.5 inch fixed straight blade.
http://www.stihlusa.com/handtools/pruning_saws.html

If you are looking for a great folding saw I recommend the Barnel 7 inch Folding Saw. I have a few of these,. They are great for everyday pruning, but if you are planning on doing some large jobs I'd go with a fixed blade saw (my opinion: straight or curved blade doesn't make a difference to me, might for you)
http://www.frostproof.com/catalog/ht03.html
frostproof.com is one of the best sites I've found for agriculture supplies.

Frank