I believe this is also posted in the Eris forum, but I thought you guys might also enjoy this. Attached is the Swype beta originally only available for the droid and nexus one, but it has been resized and works beautifully on our Heroes! Just unzip, copy over to SD and install with a file explorer. Enjoy!
XDA thread where this apk came from:
http://forum.xda-developers.com/showthread.php?t=622144
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[Device History: Alltel Apache(sold), Sprint Vogue(sold), Alltel Vogue(stolen), Alltel Diamond(traded), Sprint Touch Pro(sold), Palm Pre(sold), HERO]