For your description:

01. Basic codes 
02. Users online
03. Scroll box 
04. Ask box
05. Drop down menu 
06. Navigation bars #1 
07. Navigation bars #2 
08. Music player w/ many songs (Hypster player)
09. YouTube player
10. Putting a clock 
11. Followers counter
12. Making and putting a Cbox
13. Putting a WeHeartIt widget 
14. Rainbow text 

Other tutorials:

01. Enable ask box
02. Enable submissions 
03. Making a page
04. Putting a background in your theme
05. Changing the number of posts per page
06. Making a “Read More” post
07. Linking tagged posts
08. Tagging your answers
09. How to password protect your Tumblr
10. How to find post links on Tumblr dashboard 
11. How to let people answer your post
12. How to delete your account 
13. Making your own theme  
14. Old customize page  
15. Getting a paid domain name  
16. Infinite scrolling pages 
17. Making a blogroll page 
18. Reblog link in your post
19. Click photo to reblog 
20. Disable right mouse click
21. Disable drag and drop/selecting text
22. Blocking CTRL+U  
23. Changing the select color  
24. Energy save mode 
25. Floating text cursor 
26. Sparkle cursor 
27. Bubble cursor
28. Bubble bath effect 
29. Snow effects
30. Fading effect for pictures
31. Fadding effect for links
32. Moving title 
33. Putting a favicon
34. Putting a minicursor 
35. Putting a custom cursor  
36. Putting a Twitter badge
37. Text/FAQ above your ask box 
38. Creating a music player tab 
39. Creating a bubble music player (coming soon)
40. Creating a visitors welcome message
41. Installing a “under construction” theme 
42. Installing a “I’ve moved” theme (coming soon)
43. Viewing posts by date (coming soon) 
44. Dashboard filter by post type (coming soon)

Extensions:

01. Missing E 
02. Dashboard background
03. Checking unfollowers 
04. Tumblr Savior (coming soon)
05. Tumblr Larger Dashboard Avatar (coming soon)
06. TumTaster (coming soon)