I would really like to see some more 'Archery' based weapons in this game, it would make sense to have them in a post apocalyptic scenario where guns are (or at least should) be rare. I think you could have both bows and crossbow based weapons; bows would be more numerous, have a higher rate of fire, and have more ammo available for them (like those explosive arrowheads Rambo uses :hubbahubba:), but would require a higher strength and skill level to be accurate with them. You could have 'tibal' longbows which would be more basic and less accurate, and superior and correspondingly more expensive sporting bows. Crossbows would be far more accurate and have higher penetration as well as requiring less skill and strength to use, but would have slower rates of fire as well as being more expensive to buy and maintain. Finally, you could poison your arrowheads or crossbow bolts to make them more dangerous, plus they could be counted as 'stealth' weapons.
A more interesting weapon which I would like to see would be a http://i280.photobucket.com/albums/kk171/fattoler/sleevegun.png, this would obviously be used as a stealth weapon to be used in a restricted area or some-such at close range and does not arouse suspicion even when it isn't 'holstered'. In regular combat it would be very weak of course but to make up for it it could have a very high sneak attack critical. More http://www.littlegun.be/curios%20et%20antiquites/a%20sleeve%20pistol%20gb.htm http://www.bbc.co.uk/history/worldwars/wwtwo/soe_gallery_10.shtml.
One thing I think Fallout as a series has been lacking is the inclusion of a shield (yes I am aware shield's aren't weapons unless you are http://2.bp.blogspot.com/_iDWF4xHslTs/TTgbfXaCvYI/AAAAAAAAAWU/XxasPBOwKWM/s1600/captain_wank.jpg but I felt I'd add it here for the hell of it), that was one thing that disappointed me about the legion, after all, what's a Roman Soldier without his shield? Obviously shields would be used in tandem with one handed weapons and provide extra armour for the user, and you will be able to buy things like cheap and light wooden shields or more expensive and heavy metal shields.
Finally as a 'bonus', here is the one of the most awesome things ever, a weapon which would not only be a killing device, but also can be worn as apparel! The http://i280.photobucket.com/albums/kk171/fattoler/helmetgun.png http://www.weirduniverse.net/blog/comments/2269/! Obviously, a few improvements could be made, such as putting it in a svvanky fedora, but otherwise this could work as a regular 10mm pistol or something which gives you a 10+ survival bonus, why a survival bonus? http://i280.photobucket.com/albums/kk171/fattoler/cookingwithguns.png
And as an extra bonus, http://i280.photobucket.com/albums/kk171/fattoler/20-02-2011150551.jpg, plus an image http://i280.photobucket.com/albums/kk171/fattoler/Myhatisagun.png.