I was surprised to see the Alpha 4 release on the home page today ... a few days earlier than expected. So, of course my first impulse was to download the anyboot file, and "dd" it onto my USB drive.
I tried a number of mirrors (really slow) until I hooked into the one in Sweden. I guess Haiku is gaining popularity. There must be quite a few download requests hitting the servers this afternoon. I remember seeing the download totals on one of the developer's pages for the Alpha 3 release. If I remember correctly, the total number of downloads was in the area of 170,000 (woot woot).
Anyway, my anticipation was put off a bit as the splash screen was followed by total black-out on my MSI netbook. For some reason, Alpha 4 didn't like the netbook video (Intel Mobile 945GSE Express Integrated Graphics Controller). Just a couple minutes ago I rebooted with safe-graphics mode selected at 800x600@32 bits, and (except for needing the safe-mode) things seem to be working OK. I see the uptick in Webkit and WebPositive versions. Great!
I see this bug for the Intel-extreme/945 driver has already been given a ticket:
http://dev.haiku-os.org/ticket/8001
However; the ticket seems to have been closed about 8 months ago. It looks like the changed code implemented a "most but not all" scenario. The netbook (MSI u120 / Intel 945 graphics) worked great under Alpha 3 at a resolution of 1024x600.