Lucasia of Skullcrusher created a great post (stickied) on the WoW forums that lists gear a holy priest can use to get ready for heroics and eventually Naxx.
I took the data from that post and created a Google Spreadsheet. I did this so that I could cross off attained items and sort by dungeon/quest/difficulty, etc. This way when someone asks me if I want to go to reg/heroic dungeon X, I can sort the spreadsheet columns by that dungeon and see what is there for me. Or, I can look for an upgrade on the spreadsheet and find out where to go to get it.
The spreadsheet is here: Holy Priest Gear (Pre Naxx) Spreadsheet
You will need to sign up for Google Docs, which is pretty easy and free, in order to get full use from the spreadsheet (sorting it). You'll need to save a copy of it for yourself (in your Google Docs).
Once you have Google Docs and can save a copy of the spreadsheet for yourself (Using the "File" menu, "Create a Copy..." item), you can use the column sorting to get more value from the document.
At the top of each column is a label, such as "Item" or "Location". Right below the label is a gray bar and if you hover the mouse pointer over it you can sort the entire spreadsheet according to that column. For example, to see all the items located in The Nexus, hover over the gray bar under "Location", click the sorting triangle and choose the "A -> Z" menu option. Then scroll the spreadsheet and look for The Nexus under "Location".
Please post here with any corrections or additions.
Revision History
2009-20-01 Initial Release.
2009-22-01 Added item hyperlinks. Added Info page.
Edited, Jan 22nd 2009 6:08pm by Xert