QBar looks interesting, it takes all those quest items in your bags and puts them on a bar for you to use. Now, Blizzard has made things a lot better with their new quest tracker panel released during the WotLK era, but there are still a few items/quests where the item you need to use will not show up. Or maybe you want to minimize the quest tracker to give you more screen real estate.

The other option for things like bombing runs is to create a macro, then assign it to a hot-key.
#showtooltip
/use Arcane Charges
/use Fire Bomb
The bigger advantage of creating the macro and assigning it to a key is that often you can get two shots off before the actual cool-down (CD) gets in the way. Just keep adding "/use (itemname)" lines for other bombing type quests, which works as long as you never try to do two different bombing run quests at the same time.

I used to use an add-on named "BombersBuddy" for my bombing run quests, but that hasn't been updated in a year or two and no longer works.

Other misc links

A Warlock's Guide to the Galaxy - Add-on Extreme