The Android Gmail app was just updated with some new features for Android 3.2 (Honeycomb) tablet users. Froyo and Gingerbread users get some performance improvements too, but the meat of the update is for Honeycomb tablets.
The updated Android Gmail app adds the capability to swipe between conversations, access recent labels from a dropdown menu, set custom notifications for labels, and sync 30 days of messages. Custom label notifications work only when sync is enabled. Here's how to set it up:
Step 1: After installing the Gmail update from the Google Play Store on your Honeycomb tablet, tap the context menu in the upper right-hand corner of the Gmail app, and select Manage Labels.
Step 2: Select a Gmail label you want to customize from the left pane and tap on Sync messages to enable e-mail notifications. Choose whether to sync the last 30 days or all messages.
Step 3: Check the box next to e-mail notifications, which will enable customization options.
Step 4: Choose the ringtone for your label, vibrate options, and whether you only want to be notified once for new e-mail (instead of every new message).
That's it. Now you can distinguish your e-mails as they come in, without having to always look at your tablet.