Things to check, some as stated above:
Oil filter housing (front of motor, large black round cap). housings leak where the gasket is...bolts to the head of the motor...3 or 4 bolts.....
Power steering reservoir cap, o ring, hoses....(the one you see on the right side towards the back of the motor on the DS)
leaky valve cover gasket....(described above)
Clutch slave cylinder...side of transmission
Automatic Transmission oil pan gasket...under car, just behind motor...(remove plastic pan)
Drive shaft boots and seals....though your car is not an XI...so never mind!
cant think of anything else right now....