Yes if LiPo or Li-Ion are in a pack, they should be balanced...at least periodically.
Part of why this may not seem as prominent with Li-Ion's is in part because most chargers are single or double cell (i.e. Pila IBC, Ultrafire, DSD), and mostly with individual protection circuits built into the bottom of the cells (with AW & Pila brands, at least).
However, any commercial Li-Ion pack (i.e. Laptop) has protection & balancing circuits built into them. Many custom made Li-Ion packs do have balancing wire leads in addition to main Red/Black charging leads.