SILENT BOB IE  Would love to use shiira, but it is very buggy on 10.6. But it looks awesome and was very quick.  
(Version 2.2b090216)

ST00P!D M0NK3Y  I don't know what problem you guys are having, but it works perfectly for me. It opens fine, it doesn't crash, and I'm running the latest version of OS 10.5.8. I'm not a Shiira user by any means. I downloaded this out of curiosity from the comments. In fact, I'm typing in Shiira right now.

http://i25.tinypic.com/2dait7m.png

Try running Onyx on your system before installing this and see how that works. Onyx seems to fix bizarre issues of non-opening programs for me. I'm not having the dock issue problems either.  
(Version 2.2b090216)

TENEX  v2.2 Simply won't launch on my Leopard iMac. Back to Omniweb...  
(Version 2.2b090216)

RISEOFCHAOS  Shiira 2.2b crashs everytime when I try to launch the browser. First the Dock Icon appears then it disappears and when it appears again Shiira crashs.   
(Version 2.2b090216)

BAROQUEW  Every 6 months or so, I try to go back to Shiira and use it because it looks really impressive and neat. And then I remember why I never use it more than 5 minutes after download and then trash it. It just never works.

Now, I can't expand a window with the "+" sign: it just disappears; I can't go into the preferences either. I have a hard time picturing people migrating when the first thing they do (make window bigger anyone?) doesn't work.

Last time I tried to play with it, you couldn't run the current build if you didn't already have some older files.

I wonder what new thing will make me drop it next Christmas.  
(Version 2.2b090216)

ROBOTANK  I'm glad to see that Shiira is back from the dead. It has a lovely interface and some excellent and unique features, particularly the floating bookmark and history windows, and the OmniWeb style tab thumbnail bar. I don't think Shiira is quite ready to be my default browser (it still needs some bug fixes and better control over cookies), but I will be keeping on eye on it again and hoping to see lots of improvements in the future. Also, Glimmer Blocker and ClickToFlash (neither one is an InputManagers hack) both work with Shiira, so ad and Flash blocking are now available for it, filling in what was for me a huge hole in Shiira's feature set.  
(Version 2.2b090216)

ALFREDO_TOMATO  When I try my portal url, it downloads to the desktop. Refreshing the code on the server helps for a short time. It loads properly on Safari, Camino, Sunrise, Omniweb, Opera. Still I like Shiira a lot, and appreciate their efforts.   
(Version 2.2b090216)

IAMNOSKCAJ  This project's (perceived) current status is REALLY SAD. The first iteration of Shiira REALLY impressed me. I used it ALL THE TIME. Granted it had some bugs, which were never really fixed, but I used it FULL TIME. Then v2 came out, and I was floored. They had done it again. They turned the browsing world UPSIDE DOWN with their ideas -- but unfortunately the project seems to have died.

I'm going to investigate whether this is opensource. I know it uses the WebKit engine (which is the rendering engine that Safari uses). At least the engine is opensource, but I'm hoping the entire project is.

If ANYONE knows ANYTHING about this project's status, PLEASE reply to this comment.

THANKS!!!!  
(Version 2.2)

PAMA91  Shiira seams to be dead:

http://g.shiira.jp/groups/board_show/769

When it´s true, it´s really sad. Shiira has a gorgeous interface and some unique features.

But it´s a big buggy, especially on Leopard. I would use it again when they fix the problem with the bookmarks.   
(Version 2.2)

CHRIS FAM  Very good and elegant browser, way to go Japanese developer!  
(Version 2.2)