I modified the plugin as follows:

displayItems:function(q) {
var t = this;

if (!t.items || !$(this.$input).data(‘focused’)) return;

….

this.each(function() {
$(this).focus(function() {
$(this).data(‘focused’, ’1′);
}).blur(function() {
$(this).removeData(‘focused’);
});
new $.suggest(this, options);
});

This prevents weird behavior when you type a few chars very quickly before hitting tab. Without it, the lag introduced by the ajax call can end up showing a list of results even though its not relevant to do so.