Motorola bundles Picsel on the Motorola Ming (a1200) cellphone (my wife and I both have one.)
Motorola opts to use Opera as their web browser on the phone, 'nuff said there.
I'e found the tool useful for pulling up a document for reference purposes but using it as a reader has always been too tedious.
It would also require some non-trivial customizing to fit into iRex's plumbing, all of which I'm sure Picsel would be more than happy to do per hour for $$$. And of course anytime iRex wanted to change anything, I'm sure Picsel would be more than happy to do it per hour for $$$. And if Picsel had any bugs in their code I'm sure they'd be happy to fix those per hour for $$$ as well.