HANDYMAC  Well, I like it. I've been using WeatherDock for the last couple years, and it's great, but it's really more than I need (with a really huge menu, even on a 17" MBP display), so I was happy to find WeatherVane, which provides the basic info in a small menu (and looks tasteful in the menu bar). If I need more, I can go to a weather service's homepage. WeatherVane does what it does well; if it doesn't do what you need, there are alternatives, but don't pan it just because it isn't as huge as other weather apps.

The only thing that puzzles me is that WeatherVane, which accesses its info from AccuWeather, consistently shows temperatures for my city up to 5 degrees higher than WeatherDock, whose info comes from Weather.com. (Don't have a thermometer at my house, so I don't know which is closer to my actual situation.) Of course, this discrepancy isn't the developers' responsibility, but it does seem odd.  
(Version 2.1.1)

JEFFREY HARRIS  Lame at best.

This is extremely limited. It seems that you're only able to display ONE city at a time... unless I'm missing something. The interface is poor.

If you're looking for a free, well featured and flexible weather app, check out WeatherDock.  
(Version 2.1.1)

FORMICA  I agree with PCHARLES67 -- Meteorologist offers more weather data (if you choose to display it) and superior control over that data. Weather Vane does offer a fair amount of data, but it only displays it in a tooltip box with tiny writing, and like almost all tooltips everywhere, it doesn't display long enough to read all of it (or perhaps I'm just a slow reader!). Furthermore, Meteorologist can show the radar image for your location, but I'm guessing that few people use that function because it's buried a little deep. You have to open the Preferences, select the Cities tab, double-click your city's name, select the Weather Items tab, then put a check mark in the Radar Image checkbox, even though the word "None" in the "Unit" column is greyed out, giving the impression it's not yet implemented.

Anyway, Weather Vane is nice, but Meteorologist is superior in every way.  
(Version 2.1)

PCHARLES67  This is an attractive application, but on a small screen it takes up too much space. I prefer Meteorologist because I have a lot more control over what I can display.  
(Version 2.0.1)

WEASELBOY  Just installed this on Mac Pro with 10.5.4 and it works well. I like the simplicity of the interface.  
(Version 2.0.1)

IDJSTER  Works well. Has Canadian weather, sits out of the way in the menu bar, it works as advertised. I really like this app! Very nicely done!  
(Version 2.0.1)

HAZMAT  Looks very nice, but the menu in the menu bar looks grayed out, as well as the days of the week in the menu. Very odd.  
(Version 2.0)

DRUMSHANBO  Weather Vane doesn't seem to want to refresh on my computer (Macbook 2GHz Intel Core Duo/OS X 10.5.2). I have it set to refresh every 15 minutes. Any help?   
(Version 1.7)

HENDO  No Canada support...boo  
(Version 1.7)

JSLMG  With so many slam-dunk reviews, I'd like to try it... I live in Asia. Any plans for international support?  
(Version 1.7)