allow F1 or Alt-F1 to bring up the table definition/schema, like in SSMS-> alt F1 brings up tons of information about the highlighted table. it would be nice to have a mechanism for jumping straight to the table info via keyboard shortcut if the table name is highlighted.

openDataSource and openRowSet don't seem to work in LINQPad under LINQ instead of SQL. I use these on a number of queries, and would hate to have to go back to SQL everytime I needed data from another server on the one I'm on.

Something to identify common patterns of misuse or inefficiency in LINQ queries, and suggest alternatives

...and Linq to NHibernate once it's more stable

When saving a .linq file, make it actually save as a compiled .exe but renamed, allowing us to reference the scripts in our projects and execute them from the command line.

Most of our queries' transaction isolation level is ReadUncommitted. This is very important on our production db to minimize the impact.
I find myself surrounding my queries with TransactionScope all the time.
In addition, some of the queries requries Snapshot isolation's, etc.
It would be very helpful to allow to set the isolation level in the advanced query properties or something similar.
Thanks.

I use link pad on two machines, each with slightly different directory structures. It would be nice if my .linq file could include referenced DLLs using notation like %HOME%...\Library.dll.

It would be useful if the results pane could be detatched into a separate window for easier viewing.

Since LINQPad now supports Programs as well Statements, the ability to make the most of screen real estate becomes more pertinent.

I really would like to see for each property whether it's a readonly or a writable property. Maybe you could give the gray background of the headings some red touch for RO ones?

See:
http://forums.oreilly.com/content/C-3-0-in-a-Nutshell/3805/Linqpad-Automation-Interface-What-Are-Your-Thoughts-/