The other day a friend of mine called me up and just went on and on for several minutes about her work situation. I didn't interrupt her. She'd been having issues for a while and had finally found a quiet place where she could call me and just vent. After she got it all out of her system, she laughed and asked, "And how are you?"
Sometimes, our friends just need us to sit there and listen while they vent. Never underestimate how much this can help a friend cope with whatever they're dealing with. Sometimes they don't need advice and they don't have time for a long conversation. They just need to talk about what's weighing on their mind and by doing this with a friend who cares about them, they feel more understood and valued. It helps. Believe me.