It took a while, but this week, Google has finally launched an application for Android Google Reader, the news aggregator of free software.

I’ve been waiting for this. I am a longtime user of Google Reader, and is particularly useful when I keep an eye on niche topics, rather than general news. So far, I was especially disappointed by the mobile Web experience Google Reader on smartphones (especially on an iPhone 3G then Incredible Droid). But this app is a huge improvement.

Here’s what I like, and what I do: the application interface is much easier to work with the mobile web user interface. To comment, e-mail or share in the mobile web version of Google Reader, I had to choose a bit “other” option from the dropdown menu at the bottom of the voice – and about half the time I miss it and click on the feed item . In Android application, these functions are available when you press the phone button “menu” and are much larger and easier to use.

Google Reader Android app has better integration with social media, social bookmarking and other ways of sharing information, including text messaging. I’m not talking about the “share” feature built into Google Reader, which publishes only the item at Google Reader, which I never use. Rather, it is to use sharing tools that I want.

As an example, I am an avid user of social bookmarking services Diigo and Delicious. They are my “backup brain” for all things interesting or useful that I find on the net, and I use them to collaborate with colleagues on research projects.

Previously, when I used Google Reader via a mobile web browser, if I come across a flow element, I wanted to score in Diigo, I had to click to load the entire page where the article was published at the origin – which may take some time – - and then press “Menu” to access my “parts to Diigo” bookmarklet. That annoyed me.

In contrast, Google Reader Android application integrates all my bookmarklets share tools and options available through my phone menu key. This means that I can share a specific item in Google Reader Diigo directly, without having to go to a web browser. You can also share items directly to Facebook, Twitter, Evernote, or blog – or send items to people via email or text message. This saves me time and I like it.

I’m disappointed that, so far, there doesn’t seem to be a bookmarklet-style feature available in Android to subscribe to a feed in Google Reader. Here’s what I mean:Often when I’m checking out the Web on my phone’s mobile browser, I encounter a site whose feed I’d like to follow via Google Reader.

I’d love it if there was a “Google Reader subscribe” option available through the menu button, which would check the current page for available RSS feeds and let me subscribe to them via Google Reader — similar to how I might bookmark a page in Diigo on my phone.

However, to my knowledge, the only way they can subscribe to the feed of a site to Google Reader on my phone is to first copy the URL in the browser page, then launch the Google Reader and click “subscribe “option, which is available on the home screen of the APA, then paste this URL. The application automatically detects and then RSS feeds available on this page and allows me to subscribe. But it seems that a lot of steps.

I like having to jump the application in the browser or your browser application, the integration seems possible. I hope that Google adds to a later date.