Sorry for the double post, we have full confirmation on where things stand now...
With the Package Installer gone, what is left to check? Well, we still have to check for the various kernel exploits and the usermode exploit games.
The good news is, most of the exploit games can still be used on firmware 3.30, with the exception of the standalone released exploit game – Z.H.P.: Zettai Hero Project.
The bad news is, the kernel mode exploit, released by qwikrazor, has been fully patched and the execution of the TN-V eCFW on Firmware 3.30 is not possible (at the moment).
Sony has also added some new security mechanisms, that prevent the execution of an ‘H.BIN’ file, which we’ve used since the very first days of PSPemulator hacks for the PS Vita.
To sum it up:
Package installer is out. There is another way they had to pull the package installer up, but the program itself on the vita now has additional security measures on it, so don't expect that to work again for a long time if at all.
Exploitable games on 3.30 ALL still work except for ZHP, the problem is the kernel exploit has indeed been patched and now the Vita firmware looks for (partially) homebrew software loading. This can likely be overcome, but there is no sign of a kernel exploit release any time soon.
It's not all bad news though! Vita Update Blocker works if you're on 3.18! Well, sort of.
http://hackinformer.com/2014/04/16/a-different-way-to-transfer-games-to-psvita-ps3/
Boot that up, set your PSV to proxy on it and you'll be able to get onto the PSN as well as the store! The problem is, it's quite unstable... I can get on long enough to get into my download list and start a game downloading before it boots me from PSN (the download continues, redownloading Muramasa as we speak)
This work around has been patched before and it will certainly be patched again, so use it while you can if you want it.