So, a couple of years back I got the DnD 3.5 core books (PHB, DMG, MM). Cut to the present and I've got the three core books, Stormwrack, Dungeonscape, 10 issues of Dragon, 5 issues of Dungeon, 5 adventure modules, and 7 issues of Pathfinder.
After spending so much on 3.5 stuff, I was at first intent on staying with 3.5. I was tempted to try 4E after hearing how much fun it is, but then Paizo Publishing announced its plan to make their own improvements to 3.5 to fix its problems without invalidating people's 3.5 materials.
Now, however, I'm losing faith that Paizo's edition could be good enough to stick with. While it seems neat so far, there are problems with 3.5 that seem too big for them to solve: martial classes whose only option is full attack, sometimes incredibly time consuming preparation for games, huge stat blocks for high level NPCs, and the difficulty of running high level games.
I know there are people who have spent tons of money buying much more 3.5 material than I have, but I'd hate for it all to go to waste. At the same time, 4E sounds more fun for players and much easier to run than 3.5.
So, if I were to get the 4E books, is there any way I could adapt 3.5 edition materials? Would it be terribly difficult to make 4E conversions of 3.5 monsters? In a published 3.5 adventure, could I run it and swap out 3.5 monsters for their 4E counterparts without too much difficulty? If an adventure called for 3.5 wizard, would swapping it out for a 4E wizard be too difficult?
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Essentially, all the treasure from level to level is broken up in pre-balanced parcels which you can hand out however you see fit. You can make the parcels part of monster hoards, give them out as quest rewards, and break it up as you see fit.
Encounters are balanced toward a certain XP total per encounter. Just decide on the theme of the encounter, then populate it with enough monsters to fill the XP quota. (Edit: so for example if the party is supposed to fight goblins, let them fight goblins. Just mix up the numbers and types of goblins to meet the XP total for an encounter of their appropriate level. It may not match exactly the number and powers of those goblins in 3.5, but it will match the theme while providing an appropriate challenge to the PC's.)
"Go up, thou bald head." -2 Kings 2:23
When I get back into an apartment on a permanent basis (probably when 5E rolls out :P), I'll be pulling all my 2E and 3E books out and actively running through them for ideas. We need more Eggshell Grenades.