The idea behind Link2SD is simple. Remember Android is basically a modified version of Linux and the application files resides in /data (where '/' , or the root directory, is your phone storage). When more and more files are created in /data, your phone storage is slowly eaten up and very soon you will see the "Phone storage low" warning.
Link2SD lets you move some of the files in /data to the SD storage but retain a pointer or symbolic link in /data. This is a legitimate filesystem sleight-of-hand that retains the directory structure that Android expects, but with the bulk of the data moved to the SD card.
For example, after moving Angry Bird using Link2SD, the affected files are:
/data/app/com.rovio.angrybirds-1.apk -> /data/sdext2/com.rovio.angrybirds-1.apk
/data/data/com.rovio.angrybirds/lib/libangrybirds.so -> /data/sdext2/data/com.rovio.angrybirds/lib/libangrybirds.so
/data/dalvik-cache/data@app@com.rovio.angrybirds-1.apk@classes.dex -> /data/sdext2/dalvik-cache/data@app@com.rovio.angrybirds-1.apk@classes.dex
As you can see, the symbolic links point to a special partition on the SD card that is mounted as /data/sdext2.
Installing Link2SD is very simple. Before installing, create a second partition on your SD card. You can use a non-destructive partition manipulation tool such as MiniTool Partition Wizard to create the second partition. Depending on your needs, a partition size of 512MB to 1024MB should be sufficient. You can always increase the partition size later if necessary.
Now find Link2SD on the market and install it. After installation, reboot your phone. This will allow Link2SD to mount the partition. Now you are ready to use Link2SD. Launching Link2SD will bring you to a list of all the applications on your phone:
From there, you can choose which apps to link to the SD card. Apps which are already moved using Froyo's native A2SD method cannot be moved. You need to move them back to phone storage before you can run Link2SD on them.
I find a couple of menu functions rather useful. Under "Filter", you can choose to see only those apps that have not been linked ("Not Linked User"). Sorting that list in decreasing order of "Apk+Dex+Lib Size" using the "Sort" function will give you the top candidates for linking to the SD card (i.e. those apps that are using the most phone storage).
I also like to use Link2SD exclusively, so by using Move2SD Enabler to set the default installation location to "Internal", I don't have to deal with Froyo's A2SD mechanism again. You can also enable the "Auto link" function under Link2SD's "Settings", which will automatically link any newly installed app to the SD card. However, I did not enable this because I like to have more control over which apps I link to the SD card. Also remember that you should not link widgets, input methods, live wallpapers etc. to the SD card.
The limitation with Link2SD is that you cannot link system apps to the SD card. However, the author is working on this and this should be possible in a future release. Also, a future version may allow you to disable A2SD directly without using another app.
In summary, Link2SD is a pretty powerful tool for freeing up phone storage by linking application files to the SD card. You get a nice GUI for linking/unlinking application files, fine-grained control over which files to link (apk, dalvik cache, library files) if you wish, a set-and-forget option to automatically link applications to the SD card. All you need is a rooted phone, a few minutes to create a second partition on your SD card, and a few more minutes to install Link2SD, reboot and do a bit of linking. With minimal effort, you should never have to see the "Phone storage low" warning again.
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