UPDATE 10/26/12: A new blog post with updated links is here.
HP just released their June 2012 VMware ESXi 4.1 U2 and ESXi 5.0 U1 ISO installation media. Nearly every driver in this custom ISO has been updated from the previous release. You can find the entire driver set versions here. HP did NOT roll in the latest security updates, so they are still just shipping ESXi 5.0 build 623860. As of the date of this writing the latest build is 721882, which addresses a number of security issues.
You can download the ESXi 5.0 custom image here and the ESXi 4.1 custom image here. As always, these updates are free to download but you do need to register. If you wish to build your own HP custom ISO with the security patches rolled in, check out my article here. However, use the latest drivers listed in the HP media release notes, not the older versions referenced in my previous blog article.
Give the plethora of driver updates, I would recommend you download the updated drivers from the driver set page here and push them out via VUM to your production servers, after adequate testing.