What are the advantages and disadvantages of dual-wielding?
For weapons:
Pros:
- can get up to 4 weapon effects onto a pair of weapons.
- More DPS as you attack faster with duel wielding perks
Cons:
- can't block
- can't bash (shields/two handed weapons lets you bash)
- need to find two good weapons instead of one
For dual casting spells, you'll want to look here.