There's a couple versions on this cacko feed.
http://web.mol.ru/~zaurus/feed/(I don't use Opera, so I don't have any info about them.)
below is what the packages file describes them as.
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Package: opera
Version: 7.25-lite-2
Section: qpe/network
Architecture: arm
Maintainer: Anton Maslovsky <my-zaurus@narod.ru>
MD5Sum: 822d2af1f53f51beb4c5a3805dd323a1
Size: 1878277
Filename: opera_7.25-lite-2_arm.ipk
Description: Opera Web Browser
Package: operac3k
Version: 7.55.6079-c3k-2
Section: web
Architecture: arm
Maintainer: Stein Kulseth <steink@opera.com>
MD5Sum: 9ed33ea848258a286cf6cdfca06a10f5
Size: 2516206
Filename: operac3k_7.55.6079-c3k-2_arm.ipk
Description: The Opera Web Browser
Welcome to the Opera Web browser. It is smaller, faster,
customizable, powerful, yet user-friendly. Opera eliminates
sluggish performance, HTML standard violations, desktop
domination, and instability. This robust Web browser lets you
navigate the Web at incredible speed and offers you the best
Internet experience.
-------------------------------------------------------------
The original package from IBM's website has been modified to
correct some problems which prevented it from being used
'as is' on a Sharp SL-C3000 Zaurus after installation.
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