The code to execute a sosl search is incorrect in forcetk.js.

The original code is:

forcetk.Client.prototype.search = function(sosl, callback, error) {
this.ajax('/' + this.apiVersion + '/search?s=' + escape(sosl)
, callback, error);
}

it should be:

forcetk.Client.prototype.search = function(sosl, callback, error) {
this.ajax('/' + this.apiVersion + '/search?q=' + escape(sosl)
, callback, error);
}

The "?s" should be replace with "?q".