Shi and tsu are good for making smileys. Tsu (ツ) works better for regular straightforward smileys though.
If you want to go 2ch-style, I like ((*´Д`)ハァハァ) and (キタ━━━━━━(゚∀゚)━━━━━━ !!!!!)
I'm not sure how to make the Д and ∀ without using copypasta though. Can someone tell me the alt code for them?