I just found and am really enjoying this great vocabulary and spelling website. I'm using it to help my kids get back into the academic mind set this August.
I found their resources section particularly useful:
Contractions - You can build lists using words like: I’ll, we’ll, shouldn’t, and they’re. There are lists of what contractions SpellingCity.com supports. Abbreviations- You can build lists using abbreviations such as titles (Mr. Dr, Mrs.), measurements (oz., pt, qt.), and geographic terms (Blvd., Pkwy., and Rd.) Possessives- SpellingCity has added some sample possessive forms of nouns, both plural and singular, for spelling and grammar practice. For example: aunt, aunts, aunt's, aunts', boy, boys, boy's, boys', lady, ladies, lady's, ladies', doctor, doctors, doctor's, doctors'. As background, SpellingCity has always included both the singular and plural forms of nouns and the the forms of verbs (ex play, playing, played).
What's the Most Popular?
Dolch Words - This collection of Dolch or Sight words is perennially useful. There is both background information and lists ready-to-use. Compound Words - Kids love studying compound words. Teachers love teaching them. Does your school have a Compound Word Day? It should! Sound Alike Words or Homophones - All students and many adults benefit from practice distinguishing the right spelling and usage of its and it's; they're, there, and their; and to, too, and two. Word Confusion - This article reviews homophones, homonyms, homographs, and synonyms. Need a quick reminder? Here it is.
The Heavy Stuff: Research and Articles on Spelling