Rekonq is a webkit browser for KDE which will become default in Kubuntu 10.10 Maverick Meerkat.
Soon, Rekonq will get extensions support through Chrome's extension API which means you'll be able to install Chrome extensions in Rekonq.
Ubuntu's 10.04 repositories currently hold version 0.4.0 but you can install daily builds via a PPA (which are a lot more recent).
Rekonq 0.5 first beta will be released on May 25 with the stable 0.5 release following on June 30 and finally, Rekonq 1.0 should be released on September 12 (with a beta on August 20) which makes the release right in time for Kubuntu 10.10 Maverick Meerkat.
[Via Markus' little blog]