nik247 posted some images and a repository link in this post: http://forum.mikrotik.com/t/metarouter-images/28791/1
Edit your /etc/opkg.conf to comment out the broken openwrt rep and make it look like this:
#src/gz snapshots http://downloads.openwrt.org/snapshots/ ... r/packages
dest root /
dest ram /tmp
lists_dir ext /var/opkg-lists
option overlay_root /jffs
src/gz metarouter http://openwrt.pantele.com.ua/trunk/metarouter/packages
Then run opkg update which will pull down the new repository information. Then opkg list will show them all.
You can also just http to openwrt.pantele.com.ua/metarouter and browse what is there.
I used these images, but the packages I need are not built.