From Gamebytes:
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In-Depth: PlayStation Network Sales Analysis, June 2009
[GamerBytes checks out Sony's PlayStation Network PS3 downloadable game sales, with an exclusive U.S. June Top 10 showing how titles like Trash Panic and the re-issued Final Fantasy VII fared in their debut month.]
We’re taking a look at the Top 10 PlayStation Network titles for June 2009, supplied to us through Sony's PlayStation press representatives, following our recent look at Xbox Live Arcade sales for June 2009.
The PlayStation Network received 6 new downloadable PlayStation 3 titles during June 2009 – Trash Panic, Cellfector: Psychokinetic Wars, Wolfenstein 3D, Gunstar Heroes, Droplitz and Bomberman Ultra. The PS3's digital distribution network also included numerous big PSOne Classics such as Final Fantasy VII, Resident Evil and Metal Gear Solid – bringing us the first PSOne titles to make it into the Top 10 in the past few months.
In this analysis, we'll look to see how well each title did, see which games released for PSN in April 2009 were able to hold on, and try to determine what trends might be gaining traction in this downloadable space.
Here's the North American Top 10 for PlayStation Network games on the PS3 for June 2009:

The PSOne’s Glorious Return
May was a very quiet month for the PlayStation Network, with only one new title was able to make it to the Top 10. But with the advent of E3, some high profile PSOne titles being released and numerous $5 PSN titles debuting, the Top 10 has completely changed in June.
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You can catch the rest of the article via the link above.
It seems ps1 titles are making great headway on the Network. Of course, with high profile releases such as Final Fantasy VII, Metal Gear Solid, and the Resident Evil: Director's Cut, this was a given. What's surprising is that most notable PSN releases have just about dropped off the map. Flower and the like are nowhere to be found this mont. Let's see if they make a return with next month's chart.
I have to wonder why SCEA (and SCEE) waited so long to hop on the ps1 bandwagon. It's essentially free money. I'm sure FFVII netted a decent return. With numbers like these, it's only a matter of time before we start seeeing ps2 titles on the Network, in my opinion. Of course, they may have to be ported at first, if they can't get emulation running fully via firmware.
Here is the table from last month's article discussing the PSN in May:









