Hi

Thanks for suggesting Panasonic TZ5 and Nikon L18.
I am not interested in bigger cameras. I have left the option of Canon SX100 IS, as it is bulky although it provides the same feature as provided by Panasonic TZ5. I am interested in ultra compact camera which has zoom more than 4x therefore Nikon L18 does not suits my requirement. Therefore I have found these three cameras to be suitable for that.
1. Nikon S550
2. Nikon S560
3. Canon SD890 IS
I have also looked into Canon SD850 IS which is said to be better than Canon SD890 IS but the zoom of SD850 is less than that of SD890.
If I compare Nikon and Canon, I could not be able to figure out which is the best in cameras?
Regarding Nikon S560, it has not yet been released so there is no review comments for this camera. So could not judge on that.