"For me, the perfect combination for attack fighter groups is attack bombers and cloaked fighters, of course if resources are a problem, use scouts or interceptors but keep the bombers, they do great damage. Change formations and tactics often to make your squad harder to hit. Switch to aggressive when your fighters attack then evasive on their way back from the run, then as they turn around go to aggressive again." - X-toph

"For the graveyard level, all you need is 20 interceptors, and when i did it, i only had 8 shot by the autoguns.
Fly them up right over the junkyard, move them until there right on top of the office, and then fly down, shooting all the autoguns around, and then just go to the office. It's freaking ez, no having to deal with the dawg or anything." - MIkey

"Minelayer Corvettes are the best investment in the game. Even 4 or so can cause problems, but if you form a square or X of around 20 you can lay minefields large enough to lay waste to all but the largest of task forces before they even engage the ships you're screening behind the minefield. Each mine is a damage done and they cost nothing. Minelayers will quickly make the points back in any game.

It's also worth noting they can be used offensively too. Lay 3 X 3 fields progressively closer to the enemy mothership and you will bait a reaction from them, since you'll eventually get there. In theory by the time they react there's already enough mines laid to effectively end any reaction quite bloodyly, and the sallying force usually provides a "bridge" for the mines to follow towards the mothership. 20 minelayers backed up by a missile destroyer can wreak absolute havok for relatively little resources spent." - The Amazing Phil