How do I care for these succulents?

The two at the from look like Cereus cacti though as to which species. The lack of multiple expansion ribs suggests that they may be of the rainforest type rather than the desert type. The back one looks to be an Echeveria. The top right one is harder but still looks to be related to the Echeveria, possibly a Kalanchoe?

Is it just me or do they all look a bit sad and sorry for themselves?

Thanks Fractal - I will look up those names.

Yes Moon grower - they are looking a bit sad. The old lady who gave them to me had started cleaning out her hubbie's greenhouse ... her family members took the 'better' specimens but she just couldn't throw these away, so asked if I would take them.

As I've never grown succulents before I am looking for some help on the best thing to do for them now as I'm sure she will be checking on them.

Succulents are some of the easiest house plants to keep. Not sure Fractal is right with his kalanchoe i.d.

Half strength plant food every two weeks during the growing season.

Just thought the back one looked a bit like this Kalanchoe...

http://www.gflora.com/zen-cart/images/kalanchoeMT300.jpg

Damn Fractal I was looking at the wrong plant! You are probably right :-)

Thanks Fractal - checked out the photo and it sure does look the same. It's kalanchoe serrata.

Thanks Stjohntongue - we're in mid-spring now and it looks like they need a good feed. Ta!