searching for apps

Hi, I have a question about searching for apps, that could also possibly be a suggestion. I have found when searching for apps searches are often imprecise, this is often because I am looking for a particular type of app but don't know names I should be searching for. So my question is, although apps are grouped into particular standard categories, are there any ways to narrow searches, for example I was trying to get a list of all weather related apps up, but simply putting the search weather into the search area and selecting ios app directory gave me a massive list of results. This brings me on to a related subject, I think although general app categorisation is good, I think it really should be made possible for people to add tags to apps, so in my example if all weather related apps could be given the tag weather and a checkbox be made available to search app tags for that entered string this could be really useful. Of course this would depend on people entering tags for apps, but I think this could be a useful way of searching.