OmniWeb 4.1sp3 appears to be out, at the same place as 4.1sp1. I don't know of any improvements per say, but it seems faster.
Subject: OmniWeb 4.1 sneaky peek 3 is now available
From: Ken Case
You'll find OmniWeb 4.1 sneaky peek 3 at http://www.omnigroup.com/ftp/pub/outgoing/sneakypeek/ .
improvements. This problem is fixed in sp3.
(We haven't fixed the big leak yet, nor the reload problem--we haven't forgotten about them, and we'll fix them before we release 4.1 beta 1, but in these first few sneaky peek releases we're mostly focused on extending our compatibility and getting development builds out to you quickly so you can give us feedback.)
Originally posted by Red Phoenix
I still haven't encountered the memory leak, but I haven't left OmniWeb open for more than an hour. Now that every application opens so fast, I just have no need to leave most applications running all the time.