Currently I'm working on a lighter(and hopefuly better) revision of PDFViewer 0.3 by James Milne and NerveGas. you can find it at :
solena - Google Code
right now it's in beta stage and very usable (at least for my needs).
Improvements :
* Supports navigation by page number (little book icon on the navigation bar)
* Supports landscape
* Integration with mobile finder (Double tap on PDF files would open them with Solena)
* Remembers most recently used PDF settings (open last pdf file from last page number,offset and zoom)
* Remembers all previously opened PDF settings.(NEW in 0.3)
* Supports opening of large files
* Some little improvements
Sorry about the unfriendly way of installation, specially integration with mobile finder.
please note that tapping on Solena icon on springboard would open the most recently used pdf file from the last page with last configurations and if you didn't open anything yet,the application will display the open window which you can select files from MobileFinder.
UPDATED
Added another icon for opening files inside Solena without the need to close it, also it remembers all pdf settings.
Also in this version manual integration with mobile finder is optional.
PLEASE NOTE THAT
format of settings has changed since 0.1,so please remove com.dpasdar.projects.Solena.plist from your Preferences directory (/var/mobile/Library/Preferences) before updating.