I wrote about push-email software for Symbian. Now, I post some free push-emai software for Android.
1. Gmail, not surprising right? Yeah its de facto emai client for Android. Don't worry, you also may setup non-gmail account, eg. your company email account. Integrate email into your contact book.
2. K9-Mail. Before you download, please read user review about this software. Many them say positive, so this free app worth to try. K9-Mail is open-source, you visit its page at k9mail.googlecode.com
3. Yahoo Mail. Only support for Yahoo! Email account. The good: Integrated with Yahoo! Messenger, push notification, preview photo in inbox. The Bad: Only support Yahoo! account, huh...
Those apps above are the best I found at market.android.com, don't worry you have many options there. Happy hunting :).
Side story
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And how about RIM's BlackBerry? Push-email is one Blackberry feature that attract me. But, not any more :). Their products are overprice, and worse, no official service center in Indonesia.