SNPs information

[manish]

I had a few questions related to SNPs :

1. What are the various techniques utilized to identify SNPs in the
genome and what is the accuarcy of this kind of work ?

2. Currently, in how many genomes have the SNPs been identified with
sufficient confidence.

3. Where can the latest information about the work on SNPs (in
different genomes) be located ?

Please can someone point to some useful pointers about SNPs roles, SNP
databases and related stuff.

Thanks in advance,
Manish Anand