Yes - if I too were to list all my favourites here, we might run out of the quota allocated for this site! To make it easier on myself, I'll start with categorizing them by MD's. Of course, S.D Burman happens to be one of my favourites too!

Jayen to Jayen Kahan (Talat - Taxi Driver)
Tere Mere Sapne (Rafi - Guide)
Piya Those (Lata - Guide)
Jalte Hain Jiske Liye (Talat - Sujatha)
Kali Ghata Chaye Mora Jiya Ghabraye (Asha - Sujatha)
Soch ke ye gagan jhoome (Lata and Manna Dey - Jyoti) - in my opinion, this is one of Burman's masterpieces - but not as well known as some of his other compositions.
Poocho na kaise (Manna Dey - Meri Soorat Teri Aankhen)
Mora Gora Ang Laile (Lata - Bandini)
Jane Kya Tune Kahee (Geeta Dutt - Pyasa)
Kayee Khwaab (Rafi - Teen Deviyan)
Aise to na Dekho (Rafi - Teen Deviyan)
Megha Chaaye Aadhi Raat (Lata - Sharmilee) - semi-classical song blended with western interludes
Kaise kahen Hum (Rafi - Sharmilee) (one of the most subtle renditions of Tilang)
Jeevan ki Bagiya (Lata and Kishore - Tere Mere Sapne)
Tere Mere Milan (Lata and Kishore - Abhimaan)
Nadiya Kinare (Lata - Abhimaan)
Lena Hoga janam hame kayi kayi baar (Kishore - Prem Pujari)

Love his singing too:

Sun More Bandhu Re (Sujatha)
More Sajan Hai Us par (Bandini)
Dheere se aana Bagiyan mein (non-filmy - later sung by Kishore in Prem Pujari?)

I'm sure I'm missing a few of his other gems. Does anyone remember a dance scene in Guide, set in a village - where Waheeda does a snake dance with another woman - the music (especially the drums) is awesome.

S.R Kaushik, I believe "Ae dil mujhe bata de" is from Bhai Bhai.

Later, with more of my favourites