LucasArts's decision to release a revamp of the 1990 adventure game The Secret of Monkey Island seems to have paid off. The download-only game is on top of the current weekly PC game sales list for Valve's Steam service (based on revenues).

Another interesting trend is the pre-order sales for Aion, the upcoming fantasy MMO from NCsoft. The Collector's Edition version of the game is at number 3 this week on Steam. People who pre-order either the regular or collector's versions of Aion are automatically entered into the game's beta test before it's scheduled launch in late September.

Without further ado here is the Steam sales list for the week ending July 18:
1. The Secret of Monkey Island - LucasArts
2. Left 4 Dead - Valve
3. Aion Collector's Edition - NCsoft
4. ArmA 2 - Bohemia Interactive
5. Street Fighter IV - Capcom
6. Counter-Strike: Source - Valve
7. Dawn of Discovery - Ubisoft
8. Brothers In Arms Pack - Gearbox Software/Ubisoft
9. GRID - Codemasters
10. Team Fortress 2 - Valve